John Cannon

John Cannon

also known as Cannon & Associates

4.6
Rating: 10.0

Licensed for 16 years

Criminal defense Lawyer at Oklahoma City, OK
Practice Areas: Criminal Defense, Divorce & Separation, DUI & DWI ... +12 more

401 N Hudson, Ste 100, Oklahoma City, OK

About John

Biography

Practice Areas

15

Practice Areas

Criminal Defense 20%

Cannon & Associates fights for clients facing criminal charges in Oklahoma. We provide aggressive defense strategies and personalized representation to protect your rights.

16 years | 1,000 cases

20%
Divorce and Separation 20%

Our firm represents individuals navigating divorce and separation, working to protect your interests and help you move forward with confidence and clarity.

13 years | 1,000 cases

20%
DUI and DWI 10%

Cannon & Associates defends clients against DUI/DWI charges. We fight to protect your driving privileges, minimize penalties, and achieve the best possible outcome.

16 years | 750 cases

10%
Child Custody 5%

Cannon & Associates represents parents in custody disputes, prioritizing your child’s best interests while advocating for your rights in and out of court.

500 cases

5%
Drug Crime 5%

Our firm defends clients facing drug charges—from possession to trafficking. We fight for reduced penalties and alternative resolutions when possible.

500 cases

5%
Expungement 5%

Cannon & Associates helps clients seal or expunge past criminal records, offering a fresh start and protecting their future from the lasting impact of prior convictions.

500 cases

5%
Family 5%

Our firm represents clients in all areas of family law, including custody, divorce, and adoption. We’re here to protect what matters most—your family.

500 cases

5%
Federal Crime 5%

Cannon & Associates defends clients facing federal charges. We have experience with complex federal cases and are ready to fight for your future.

500 cases

5%
Nursing Home Abuse and Neglect 5%

Our firm represents families seeking justice for loved ones harmed by nursing home abuse or neglect. We fight to hold facilities accountable and protect your family.

100 cases

5%
Violent Crime 5%

Our firm fights for those charged with violent crimes, including assault, robbery, and more. We build strong defenses to protect your rights and freedom.

16 years | 1,000 cases

5%
White Collar Crime 5%

Cannon & Associates defends professionals accused of white collar crimes. We handle fraud, embezzlement, and more with discretion and experience.

500 cases

5%
Cannabis Law 3%

Cannon & Associates helps clients navigate cannabis-related legal issues. We defend your rights and help you stay informed of Oklahoma’s evolving laws.

500 cases

3%
Military Law 3%

Cannon & Associates defends service members in military justice matters. We understand military law and work to protect your career, record, and future.

16 years | 100 cases

3%
Adoption 2%

Our firm helps families navigate adoption with confidence and compassion. We ensure the legal process is smooth so you can focus on your growing family.

500 cases

2%
Guardianship 2%

Our firm helps families establish guardianship to protect vulnerable loved ones. We guide you through every step of the legal process with care and clarity.

500 cases

2%

Fees and Rates

Cost

Free Consultation

$0 first 30 minutes

Retainer

Sometimes


Payment Methods

  • Cash
  • Check
  • Credit Card

Licenses

Licensed in Oklahoma for 16 years

State: Oklahoma

Acquired: 2010

Authorized to Practice Law

No misconduct found

Location

Cannon & Associates

401 N Hudson, Ste 100, Oklahoma City, OK, 73102

Cannon & Associates

1425 S Fretz Ave, Edmond, OK, 73003

Cannon & Associates

303 S Peters Avenue Ste 100, Norman, OK, 73069

John Cannon's Reviews

Avvo Review Score

4.6 /5.0

34 Client Reviews

Showing 1 - 5 of 34 reviews

Posted by Taylor B | November 02, 2026 | Hired Attorney

They almost ruined my life because of lies.

PLEASE READ. They will lie to you, scam you of 10k, They will manipulate you into giving up rights without telling you what they mean. They will try to trick you into giving up your legal services to them if you question anything. They will NOT BE HONEST WITH YOU. They almost ruined my life if it was...n't for Billy Coyle law firm who looked at my case after I desperately called other law offices to see if what Cannon was doing was normal. I was informed by him, and 5 OTHER LAW OFFICES, who all told me they have done literally nothing and I should demand my 10k back. Billy even took my case on because he was so shocked at how long they have sat on my cases AND DID NOTHING. - The lawyer they gave me never even did discovery , and ran me around for a YEAR, She never even told me my charges nor ANY OF THEM ASKED ME WHAT HAPPEND. -Cannon fires her, and NEVER TELLS ME. I find out by showing up to court and getting a Text that some guy named Tom will meet me, I have never talked to Tom or met him in my life. He shows up and tells me to waive my right to a palmary hearing and if I don't it will make me look bad. I had no idea what that meant and out of fear I did it. Which I was later told me 5 different law offices that they have no idea why they would tell me to do that. - At this point I start feeling like something isnt right, so I start calling other law offices to have them tell me if it is, and all 5 told me this is not 10k worth of work at all and I need to demand my money back and to see an itemized statement, which they tell me they dont have because the 10k is a "flat fee" It is NOT. They have them. They dont want you to see it because they will charge you $30 a text even if they have to reach out to you to inform you if changes, you still pay. It was honestly so fluffed , the other law offices couldn't make sense of it. - I start to demand HALF of my money back (They still had $3,500 of my money un used and I even said I would be ok with that) now this is when it gets weird. I ask for a in person meeting for someone to go over it all with me and make it all make sense. (SPOILER THEY NEVER SET A MEETING UP WITH ME! 10k I paid these people and they couldnt even do that) I start getting these aggressive calls from billing telling me Im not getting anything back and once again trying to manipulate me into saying certain things to drop them. They even told me they were going to drop me because I kept asking for a in person meeting. I will be seeking legal action with the help of a law office who looked over this with me. TLDR: Once they get their 10k, you might as well use ChatGPT as your lawyer, its literally what I had to do to understand anything because good luck getting ahold of anyone. They manipulated me out of rights that I later had to ChatGPT because I didn't understand it and they never explained it.

Posted by Tamara | August 19, 2025 | Hired Attorney

Best Law Firm!! Thank you!

The team at Cannon & Associates is amazing! Highly recommend. They clearly care about the people they represent. They are organized, always very professional, and very detail-oriented. I wouldn't hesitate to hire them again in a heartbeat.

Posted by anonymous | January 22, 2025 | Hired Attorney

Dont hire

Do not use this law firm!!! They give you a lawyer fresh out of law school that doesn't know what they are doing and they double bill you and tap out your account with lots of unnecessary charges and when you try to talk to the owner john cannon to dispute the false charges JOHN CANNON refuses to ta...lk to you about it and they tell you that you must go through a chain of commands that resulted in absolutely NOTHING. We put 5k dollars in our account and they tapped it out before even doing anything. We are in a worse situation then before we started. THE ONLY THING FIERCE ABOUT THIS COMPANY IS HOW FIERCLY THEY DRAIN YOUR ACCOUNT. They charged us 957 dollars for roughly 22 emails and double billed us on about 4 things. They also lie about how many minutes they talk to you and spend with you. Hannah is our attorney. We had a motion filed to remove a lawyer on the other team that is a conflict of interest. Our lawyer Hannah went to that court date and didn't even tell us about the motion being discussed and in return because we weren't able to be there, the motion was denied. I've dealt with lots of different attorneys and this is the absolute worst experience EVER. Now we are back at square one again financially. This company holds no accountability whatsoever

Posted by Michael | March 26, 2024 | Hired Attorney

Liar, Theif

Do not hire this man to represent family matters. He is being investigated by the Bar for malfeasance and will catch a lawsuit for his actions. Do not work with this person.

Posted by Michelle Ramirez | May 23, 2022 | Hired Attorney

Erick Harris and this law firm saved my life!!

I had no idea what to expect when my husband of sixteen years told me he wanted a divorce; he left the state with the kids. From the second I called Canon and Associates, I knew that there was no other law firm in Oklahoma I would want to handle my case. Lisa Smith is always there for every questio...n; she always seems to get back right away. She is so caring and empathetic; EVERY law office needs a Lisa. I was assigned Erick Harris, and after googling him, I felt a wave of relief. He is a highly regarded attorney in the state with an impeccable reputation. I was impressed that he knew the judge that we would appear before the trial. Erick and the firm have treated me with respect throughout this process, and despite shooting myself in the foot on numerous occasions, I have never felt embarrassed or judged. Erick continues to fight and has my back on all issues despite being my own worst enemy. When I had a panic attack at the courthouse before the temporary order hearing, Kelly stayed with me on the phone and calmed me down. She contacted Erick and gave me an ETA until he arrived. She was incredibly kind, compassionate, and caring. The day of the hearing was a blur for me; I was in such an emotional state Erick sat with me after the hearing and just listened as I poured my heart out and cried. This man probably had many other things to do, yet he sat there with me. I feel it is essential to have a law firm that views you as a human being and not as a dollar sign. This law firm far exceeded any expectations I had of them. I still have a ways to go in my Divorce journey, but I know I am in the best hands. If you require a law firm and Divorce attorney, this is the law firm with the people you want standing by you!!! Do not hesitate or waste a precious second; call them now. Trust me; it is the best decision you will make in your life.

See All Client Reviews

John Cannon's Lawyer Endorsements

Endorse John
Gordon H. Hirsch headshot
Gordon Hirsch

Criminal defense lawyer | Jul 24

Relationship: Fellow lawyer in community

"I endorse this lawyer. Mr. Cannon is very respected in the legal community. I can't be thankful enough for having met him."

Clay Rowe Zelbst headshot
Clay Zelbst

Criminal defense lawyer | May 10

Relationship: Worked together on matter

"John is a great lawyer. He is very professional, well prepared, and he fights hard for his clients."

Courtney Lee Zamudio headshot
Courtney Zamudio

Criminal defense lawyer | Apr 04

Relationship: Opposing Counsel on matter

"I worked alongside John while he was at the Oklahoma Public Defender's office. He is very passionate about his work. He is a wonderful advocate for his clients."

Michelle Ann Roller headshot
Michelle Roller

Criminal defense lawyer | Apr 03

Relationship: Fellow lawyer in community

"I endorse this lawyer. John and I worked together at one point and I know him to be passionate and caring about his clients."

Angela Singleton headshot
Angela Singleton

Criminal defense lawyer | Mar 14

Relationship: Fellow lawyer in community

"I endorse this lawyer, I have known John for many years, he is a passionate litigator and a well respected professional."

Marcy Fassio headshot
Marcy Fassio

Criminal defense lawyer | Mar 14

Relationship: Fellow lawyer in community

"I endorse this lawyer. I have seen John in the courtroom numerous times - he is experienced and knowledgeable."

Adam R. Banner headshot
Adam Banner

Criminal defense lawyer | Mar 14

Relationship: Fellow lawyer in community

"I have known John for the better part of 10 years. He is respected both inside the courtroom and out. I endorse this lawyer."

Collin W. Rockett headshot
Collin Rockett

Criminal defense lawyer | Mar 14

Relationship: Fellow lawyer in community

"Mr. Cannon is a passionate, well-respected advocate for his clients. I highly recommend him to anyone facing criminal charges."

Frank A. Urbanic headshot
Frank Urbanic

Criminal defense lawyer | Mar 13

Relationship: Fellow lawyer in community

"Mr. Cannon is both a patriot and great attorney. He's served as a JAG, helping members of our military, for years. Additionally, he protected the rights of the most vulnerable among us as a public defender."

Mack Kelly Martin headshot
Mack Martin

Criminal defense lawyer | Mar 06

Relationship: Fellow lawyer in community

"I endorse this lawyer."

Ali William Khalili headshot
Ali Khalili

Criminal defense lawyer | Mar 05

Relationship: Fellow lawyer in community

"I have known John for several years and have seen him represent many clients with great zeal and tenacity. He has a great reputation within the community for his honest and hard work on behalf of his clients. I would endorse Mr. Cannon for any type of criminal matter that someone may be facing."

Chad W. P. Kelliher headshot
Chad Kelliher

Unknown lawyer | Mar 05

Relationship: Fellow lawyer in community

"John is an experienced, personable, and ethical attorney who fights hard for his clients. I fully endorse him."

View All Endorsements
Steve Douglas Elliott headshot
Steve Elliott

Nursing home abuse and neglect lawyer

Glenn Brown headshot
Glenn Brown

Family lawyer

James J. Biscone headshot
James Biscone

Personal injury lawyer

Ashley Manning headshot
Ashley Manning

Personal injury lawyer

Joseph Christopher Biscone II headshot
Joseph Biscone

Personal injury lawyer

Clay Rowe Zelbst headshot
Clay Zelbst

Criminal defense lawyer

Courtney Lee Zamudio headshot
Courtney Zamudio

Estate planning lawyer

Lauren Guhl headshot
Lauren Guhl

Family lawyer

Michelle Ann Roller headshot
Michelle Roller

Criminal defense lawyer

Brent Dishman headshot
Brent Dishman

Military law lawyer

Evan King headshot
Evan King

Criminal defense lawyer

Angela Singleton headshot
Angela Singleton

Criminal defense lawyer

Ali William Khalili headshot
Ali Khalili

Criminal defense lawyer

Frank A. Urbanic headshot
Frank Urbanic

DUI and DWI lawyer

Elliott Clark Crawford headshot
Elliott Crawford

Criminal defense lawyer

John Hunsucker headshot
John Hunsucker

DUI and DWI lawyer

Daniel Charles Hays headshot
Daniel Hays

Litigation lawyer

Adam R. Banner headshot
Adam Banner

Criminal defense lawyer

Chad W. P. Kelliher headshot
Chad Kelliher

Personal injury lawyer

David Chandler Hamel headshot
David Hamel

Criminal defense lawyer

Experience

Rating:  10.0 (Superb)

Honors

2019

Super Lawyers Rising Star, Super Lawyers

2018

Client's Choice, Avvo

2018

Top 40 Under 40, National Trial Lawyers

Work Experience

2018 - Present

Owner, Cannon Law Firm, PLLC

2013 - Present

Deputy Staff Judge Advocate, Oklahoma Military Department

2016 - 2017

Assistant Attorney General, Oklahoma Attorney General

2011 - 2016

Assistant Public Defender, Oklahoma County Public Defender's Office

2010 - 2011

Assistant District Attorney, Canadian County District Attorney's Office

Associations

2016 - Present

Oklahoma Bar Association, Bench and Bar Committee

Member

2016 - Present

Oklahoma Bar Association, Military Assistance Committee

Member

2013 - Present

Judge Advocate Association

Judge Advocate

2012 - Present

Oklahoma Criminal Defense Lawyers Association

Member

2010 - Present

Oklahoma Bar Association

Member

2009 - Present

William J. Holloway, Jr. American Inn of Court

Member

Sample of Legal Cases

State of Oklahoma v. Adam Easley

Not Guilty Verdict

State of Oklahoma v. Henry A. Long

Not Guilty verdict

United States Army v. D.S.

Not Guilty

United States Army v. D.S.

Not Guilty

See More Legal Cases

Education

2013

Judge Advocate General's School, U.S. Army

2010

Oklahoma City University School of Law

Juris Doctor

2006

University of Kansas

BA - Bachelor of Arts

Speaking Engagements

2018

The 2018 Sovereignty Symposium

THE FUTURE OF CRIMINAL JURISDICTION ON “INDIAN LAND” & THE 2018 SOVEREIGNTY SYMPOSIUM

2015

Leadership Conference at Fort Belvoir

Supervising Paralegals and Subordinate Attorneys

2013

a Night with the Justices

Military Justice

Publications

2018

The Sovereignty Symposium THE FUTURE OF CRIMINAL JURISDICTION ON “INDIAN LAND”

2016

Oklahoma Bar Journal Investigative Detention, the Warrantless Seizure of Citizens

2013

Oklahoma Bar Journal Baxter a 'Warranted' New Frontier

Languages

English

Activity

Avvo Rating

Our Rating is calculated using information the lawyer has included on their profile in addition to the information we collect from state bar associations and other organizations that license legal professionals. Attorneys who claim their profiles and provide Avvo with more information tend to have a higher rating than those who do not.

What determines Avvo Rating?
  • Experience & background Years licensed, work experience, education
  • Legal community recognition Peer endorsements, associations, awards
  • Legal thought leadership Publications, speaking engagements
  • Discipline Disciplinary information may not be comprehensive, or updated. We recommend that you always check a lawyer's disciplinary status with their respective state bar association before hiring them.
Avvo Rating Levels
10.0 - 9.0 Superb8.9 - 8.0 Excellent7.9 - 7.0 Very Good6.9 - 6.0 Good5.9 - 5.0 Average4.9 - 4.0 Concern3.9 - 3.0 Caution2.9 - 2.0 Strong Caution1.9 - 1.0 Extreme Caution

Exploring your options?

Describe your situation and generate a short list of local lawyers to consider.

Exploring your options?

Generate a short list of local lawyers to consider.

It seems like you might be looking for a Criminal Defense lawyer. Is that correct?