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Sean Francis Mangan

Military law Attorney at Silverdale, WA

5.0   78 reviews

also known as LTC(Ret) Mangan, US Army, Of Counsel to the Law Office of Jocelyn C. Stewart

  • State Years
    Washington - WA 4 years
    Oregon - OR 19 years
  • Licensed for 4 years
    State WA
    Acquired 2019
    Active No misconduct found
  • Licensed for 19 years
    State OR
    Acquired 2003
    Inactive No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About Sean

Learn Sean’s areas of practice.

Practice areas
  1. Military law
    Military Criminal and Administrative Matters: Representation during investigations, Defense against Courts-Martial & Administrative Separations, Rebuttal to Letters of Reprimand, Negative Evaluations, and Medical Credentialing.

  2. Criminal defense
    I primarily take cases for military family members arising from on-post incidents.

  3. Family
    I occasionally take on divorce and family law issues for military families.

Unmatched Experience in military justice matters.  For 30 years I've worked criminal cases from every angle:  on the streets and in the courtroom, civilian and military jurisdictions at local, state, and federal levels.  I've been a law enforcement officer, Soldier, prosecutor, defense counsel, magistrate, appellate counsel, law professor, and judge.  As a retired Army JAG Lieutenant Colonel, with prior Military Police and Special Operations experience, I bring a superior range of skills, knowledge, and abilities to serve you.

My services are reserved for those who serve our country and communities:  military personnel, veterans, first responders, and their families.  If everything you've built and worked so hard to achieve is at risk, don't take chances. Your service deserves the best defense.

I am also proud to be affiliated with the Law Office of Jocelyn C. Stewart.

We are ready to fight for you.

Photos and videos

Contact Sean

Mangan Law
10661 Old Frontier Rd NW
Suite 211
Silverdale, WA, 98383
The Law Office of Jocelyn C. Stewart
1201 Pacific Ave.
Suite 600
Tacoma, WA, 98402
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5.0 / 5.0
  78 customer reviews
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Posted by Ryan | September 19, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Sean is a Criminal Defense EXPERT
Sean and I met in 2022 during a very uncertain time in my life. I had recently resigned from a police department and was in transition to the sheriffs office, working an interim position with a security company. A company that I later found out had some very shady business practices. Before I knew it, this shady company put me into a position where I was facing criminal charges for an offense that I did not commit. This also lead to a review for police decertification. I lost my conditional offer to the sheriffs department and watched all of my life opportunities fall away as criminal charges loomed over my head. However, Sean stayed by my side and guided me through the entire process, even despite uncertainty. During the process, Sean demonstrated unwavering integrity, working with his impressive network of connections with courts and attorneys to win my case. He also displayed immense knowledge on criminal defense. He worked tirelessly and devoted time even outside of our original contract to ensure that I would get the justice I deserved. Sean represented me through the entire court process and we got all charges dropped with prejudice. Because of Sean, I got the chance that I deserve to resume my law enforcement career.
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Posted by Quinn | September 7, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Glad he is on my side!
I reached out to Sean after a positive urinalysis after a 100% test. After taking my case Sean was quick to catch me up to the entire process that was about to happen. No one in my chain was going to tell me these things. Sean made me feel safe and secure during the entire process. He made sure I was always prepared and made me look professional and on top of everything they threw at me. Thanks to Sean’s work I have a real fighting chance to stay in the army and continue my career.
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Posted by Peter | July 27, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Best decision for any military active duty or government service physician
I had an issue with military medical privileging. The due process of afforded government service physicians is not due process at all. I got no response from my organization until Shawn began to represent me. His passion, attention to detail, tireless work ethic, and desire to see justice done for me as his client was outstanding. His knowledge of the military, credentialing process, risk management/quality assurance, rights of physicians made this very painful experience result in a 100% good outcome for me. If you are a military, active duty or government service physician, and you have issues with your medical privileges or credentialing, Mr. Sean Mangan is the one and only lawyer I would ever consider representing me.
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Posted by anonymous | July 6, 2023
This review is from a person who hired this attorney.
| Hired Attorney
15-6 Investigation Closed Favorably
Major XXX was investigated for allegations of counterproductive leadership, failure to treat others with dignity and respect. IO findings substantiated the allegations. Attorney Mangan prepared a Strong Rebuttal for the Approving Authority resulting in the Approving Authority closing the 15-6 Favorable!
Posted by Gary | June 30, 2023
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
The advice given by Sean during my consult was very helpful. He was very accurate and professional. He was also helpful by providing a free of charge consult. I would highly recommend Sean for legal advice especially if you are military.
Posted by anonymous | June 29, 2023
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Thankfully, my matter was handled at a lower level. LTC (Ret.) Mangan was very helpful in guiding me through the early stages of my case with a free consultation.
Posted by Montrel | June 25, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Highly Recommend!
I highly recommend Sean! I was falsely being accused of numerous things from the Army CID and he represented me in the best way possible. He stayed on top of the situation and made sure to stay in contact often updating me along the way. He absolutely took all the stress off my shoulders and reassured me he’s there for for every step along the way. If you’re in the military and need legal representation I 100% recommend Sean. He went above and beyond to make sure all needs were met.
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Posted by anonymous | June 23, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Air Force Service Member
This man brought me from a place I thought I wouldn’t ever come back from and brought me back to the top! I 100% recommended his services. He stays in contact, understands your needs, keeps you calm, and I really know what he is doing and very good at it. Thank you Sean, for getting my career back!
Posted by anonymous | May 30, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Sean is an exceptional attorney that brought me from an Article 15 and potential court-martial to an LOA.
Sean is an extremely knowledgeable and experienced attorney. He showed great care and attention not only to my case, but also to me. When offered an Article 15, which stemmed from a false accusation of misconduct, I decided to find a more experienced UCMJ attorney for help since my military attorney did not seem up to the task. I decided to go with Sean, and I have no doubt that I could not have had a better outcome. With his advice, I turned down the Article 15 and demanded trial by court-martial. The command did everything in their power to investigate me and examined my entire career up to that point. The command maintained that they would bring charges against me, but Sean showed them how weak their case was. In the end, the general officer over my case decided to administer an LOR. With Sean’s help we submitted a formal response to the LOR, and it was ultimately reduced to an LOA. And that was not all. I was selected for promotion during the investigative period, so after the conclusion of the investigation and the subsequent administrative action, I was temporarily removed from the promotion list while it underwent review in a Promotion Proprietary Action. Sean helped me put together a package for my defense to submit with the PPA. After a lengthy review by many levels of leadership up to the SecAF, the SecAF ultimately made the decision to uphold my promotion! I do not think this would have been possible without Sean’s help. Sean helped me through what seemed like insurmountable odds, and I know that his knowledge and experience are what got me a favorable outcome in the end.
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Posted by Ian | May 10, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Exceptional legal representation
Sean Mangan is an excellent lawyer and I am honestly very grateful to have him representing me. I would find it hard to believe there is a lawyer who could compare to him on both the military and civilian side of things, he is very wise and he is excellent at defusing a situation and getting around to peoples better side. Personally I felt like he was very invested in my case and he actually cares about how the case affects you and your family. He is very thorough and dedicates the appropriate amount of time to you and your situation. Honestly I can’t put into words how great he is but being represented by him is literally a privilege. Thank you Sean Mangan.
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Posted by Matthew | May 5, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Acquittal of DV Charges and Dismissal of SA charge!
A year ago now (May) I was extremely caught off guard by 2 domestic violence allegations by my wife and 1 sexual assault against my first wife. Once charges were preferred in August, I hired Mr Mangan and he immediately put my mind at ease that we would be able to handle them and I would be able to carry on with my 12 year Air Force career as an NCO. He got the SA charge dismissed after the A-32 Hearing and a recommendation to dismiss all charges. Mr Mangan checked in often with me on the phone, kept track of my ongoing divorce and custody battle (even though he wasn't my attorney for it), and GENUINELY cared about me as a person and not just as "another client". When we did get to my recent court martial, getting to meet Mr Mangan in person was a true honor, despite the circumstances. He had amazing advice, brilliant tactics, and a very strong presence in the courtroom. His knowledge of the law right off the top of his head was incredible, and it was well worth hiring him on in orded to fight the charges and get a full acquittal at trial! He dissected the evidence, took in my (extremely honest) input, and then convinced the 8 member jury that I was not guilty of all charges! I'm also going to he able to use a few things stated by my accusers in my family court case, which not only caught them off guard when he brought the topics up, but also surprised the prosecution and aided the jury in their speedy deliberation! It honestly was an honor to have Mr Mangan and his paralegal, Ms Hendrix, on my side! There was a huge weight lifted off my shoulders this week and now I can keep moving with my active duty career.
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Posted by Unique | April 5, 2023
This review is from a person who hired this attorney.
| Hired Attorney
When I needed help he reached out to me and believe me right away when none else did.
Posted by Matteo | April 3, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Outstanding Knowledge of Law
I could say a thousand things on the service Mr. Mangan provides. I firmly appreciate the positive and corrective guidance, Mr. Mangan provided me. I felt I could trust him, I felt he wouldn’t leave me out to fight this battle I was handling alone. I requested Mr. Mangan’s services and he definitely provided. He did his job and if it wasn’t for him I believe I would not have had the outcome that I did. He didn’t save my career, Mr. Mangan saved my future! Thank you!
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Posted by anonymous | March 13, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Amazing Service
Mr. Mangan helped me get GOMAR filed locally and showed my command that I am worth keeping and allow me to continue my career.
Posted by anonymous | March 9, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Couldn’t have survived this without him
Sean’s assistance was a game changer. At a point in my military career where an investigation going south would mean 20 years wasted, Sean helped me secure my future and fought for me. I could not have survived this process without him.
Posted by anonymous | March 1, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Former Law Enforcement Officer
I am a former Law Enforcement Officer in Washington State. Sean did an excellent job defending my Law Enforcement Commission from de-certification. He adapted quickly, spoke clearly and professionally and his background certainly impressed.
Posted by anonymous | February 3, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Saved my Career
I'm a LT that was accused of a SHARP. I didn’t want to sit around and “trust the process”. Right after I was read the initial SHARP counseling, I contacted Sean. He walked me through every step, and this was just the consultation. He was with me every step of the investigation. When we were in the "waiting period" he called every so often to make sure I was ok and that he is still in it to win it. I trusted this man and he did not disappoint. In the end I was able to get my career back and continue serving in the Army. Truly don’t hesitate and “trust the system”. I can’t thank Sean enough.
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Posted by George | January 13, 2023
This review is from a person who hired this attorney.
| Hired Attorney
Reliable support
Sean was recommended by another lawyer could could not help me and after great consultation I decided to trust him. He explained in depth the legal process waiting for me with all it’s intricacies and offered a strategy that I followed to the letter. After many long months it has ended as promised. All the time I felt that I have a trusted friend and a guide leading me through unknown and frightening territory. Thanks, Sean!
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Posted by anonymous | December 23, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Highly Recommend
Lt Col (Ret) Sean Mangan is not just a stellar lawyer but also a wonderful human being. It started with the very thorough consultation, information gathering and then ultimately the strategy. Some of you may know that in the military most things can get side ways, but with his guidance, brilliance and focus…..I got the result that we were hoping for. During the long process, he texted me several times encouraging me to remain positive and to take care of myself. Call him and be honest with the information that you give him, he will fight tooth and nail for you. Highly recommend.
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Posted by anonymous | December 12, 2022
This review is from a person who hired this attorney.
| Hired Attorney
Restoration of Livelihood & a Life
We hired Sean to help us with an employee who had been denied base access over 7 years ago. The company had tried for those 7 years to rectify this issue with no success. This was for something that happened & was restituted for over 30 years ago. The help and support we received from Sean and his Team provided was nothing short of exemplar and we as a company and our employee will be forever grateful for Mangan Law’s diligence to get the issue expunged. This action restored our employee’s ability to improve his livelihood and ultimately his quality of life. I would highly recommend Mangan Law & Sean for any of your legal service needs although I know, with his Army Service Experience & background he specializes in Representing & Defending those on the Front lines of America’s Defense. Thank you isn’t enough. Sincerely grateful.
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  • Free Consultation 30 minutes
Payment methods
Check, Credit Card


AVVO RATING 8.6 (Excellent)

Work Experience

  • Owner/Attorney
  • Mangan Law
  • 2020 - Present
  • Criminal Law Policy Attorney
  • US Army
  • 2018 - 2020
  • Trial Judge
  • US Army
  • 2015 - 2018
  • Regional Defense Counsel
  • Us Army Jag Corps
  • 2013 - 2015
  • Professor of Criminal Law
  • 2010 - 2013
  • Special Operations Legal Counsel
  • DOD/Joint Task Force
  • 2009 - 2010
  • LLM Candidate
  • Us Army Jag Corps
  • 2008 - 2009
  • Supervising Appellate Counsel
  • Us Army Jag Corps
  • 2007 - 2008
  • Appellate Counsel
  • Us Army Jag Corps
  • 2006 - 2007
  • Special Assistant United States Attorney
  • Department Of Justice
  • 2005 - 2006
  • Chief of Military Justice
  • Us Army Jag Corps
  • 2005 - 2006
  • Military Magistrate
  • Us Army Jag Corps
  • 2004 - 2004
  • Administrative Law Attorney
  • Us Army Jag Corps
  • 2003 - 2004
  • Intern Prosecutor
  • Lane County Prosecuting Attorney
  • 2002 - 2002
  • Intern Prosecutor
  • Us Army Jag Corps
  • 2001 - 2002
  • Officer
  • US Army Military Police
  • 1996 - 2000
View all work experience


  • US Army Command & General Staff College
  • Leadership
  • 2011
  • US Army JAG School
  • LLM Military Criminal Law
  • 2009
  • University of Oregon School of Law
  • JD - Juris Doctor
  • 2003
  • Gonzaga University
  • BA - Bachelor of Arts Sociology and Philosophy
  • 1996
View all education

Legal Cases

  • United States v. Lt Col WH, USAF
  • NG to 10 of 11 charges. Appeal ongoing with USAF Ct of Criminal Appeals
  • United States v. SGT CB, US Army
  • Full Acquittal: Not Guilty to all Charges and Specifications
  • United States v. SGT RR, US Army
  • Not Guilty to all contested charges, no punishment adjudged
View all legal cases


  • Washington Defenders Association
  • Member
  • 2021 - Present
  • International Association of Military Criminal Defense Lawyers
  • Member
  • 2020 - Present
  • Washington State Bar Association
  • Member
  • 2019 - Present
  • Oregon State Bar #035465
  • Member
  • 2003 - Present
  • American Bar Association
  • Member
  • 2000 - Present
View all associations

Languages Spoken

  • English

Honors and Awards

  • Bronze Star Medal
  • DOD
  • 2010
  • Superior Advocate Award- Mock Trial
  • University of Oregon School of Law
  • 2001


  • US Army
  • Army Regulation 27-10 (current edition)
  • 2020
  • Crimes and Defenses Deskbook
  • 2011

Speaking Engagements

  • Military Law Section (LAMP)
  • Military Justice Overview and Update
  • 2016

Attorney endorsements

Received (4)
Given (1)
Endorse Sean
Criminal defense Attorney | Aug 16
Relationship: Worked together on matter
"Sean Mangan is an expert litigator and a master in the courtroom. I had the fortune of working with Mr. Mangan on a criminal case that went to trial. The client's interests were represented to the full maximum potential. As an attorney, I would turn to Sean Mangan for tips on a wide spectrum of topics. I learned a great deal from Sean. With his knowledge base and calm demeanor, he made the trial team feel confident every step of the way. Sometimes, the battle is won before trial begins and Sean prepares his clients like no other. Highly recommend."
Military law Attorney | Jun 30
Relationship: Fellow lawyer in community
"I worked with Sean on several cases as his co-counsel. He is a knowledgeable professional with years of experience, including time as a military judge. He provided excellent representation to his clients and got results beyond expectations. Judges he practices in front of see him as a peer and respect his experience and arguments."
Military law Attorney | Oct 16
Relationship: Worked together on matter
"Sean Mangan is one of the most knowledgeable and hardworking attorneys in his field. Dedicated and committed to every client and every case, Sean brings experience as a prior military judge, prosecutor, and defense attorney. I do not hesitate to endorse him."
Military law Attorney | Sep 28
Relationship: Co-worker
"I wholeheartedly endorse this lawyer. Sean is an exceptional attorney with a ton of experience. What people cannot learn from experience, Sean naturally possesses. This means he is a knowledgeable, talented, and gifted lawyer."
Military law
Silverdale Military law Lawyer Sean Francis Mangan
Sean Francis Mangan
Military law Attorney
Silverdale, WA
Licensed for 19 years
Free Consultation