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Dennis Sysko

Administrative law Attorney at Glen Burnie, MD

5.0   8 reviews
  • Licensed for 43 years
    State DC
    Acquired 1979
    Good Standing No misconduct found
  • Licensed for 46 years
    State MD
    Acquired 1976
    Inactive - Retired No misconduct found

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

About Dennis

Learn Dennis’s areas of practice.

Practice areas
  1. Administrative law
    Security Clearance Appeals, Hearings before the Defense Office of Hearings and Appeals (DOHA), Representation at Personal Appearances and Disciplinary hearings.

    34 years, 150 cases

  2. Corporate and incorporation
    Incorporation and creation of entities, Development of Infrastructure, Litigation, Licenses, Merge and Acquisition, Corporate Advice.

    47 years, 80 cases

  3. Government
    Security Clearance Appeals, Facility Security Clearance Issues, Inspector General Investigations, Federal Contract Disputes, Defense Hearing and Appeals Hearings, Employment Discrimination and Adverse Actions.

    47 years, 50 cases

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Dennis Sysko
306 Crain Hwy N
Glen Burnie, MD, 21061-3007


5.0 / 5.0
  8 customer reviews
5 Star
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1 Star
Posted by Daniel | April 20, 2017
This review is from a person who hired this attorney.
| Hired Attorney
From a grateful client
Mr. Sysko is very knowledgeable in regards to all matters related to Intelligence Community, IC, security and this was very much on display in my case. His experience and ability to relate IC policy to the matters at hand and provide justifiable argumentation was invaluable. I recommend his service highly.
Posted by anonymous | July 13, 2015
Legal Representation for Clearance Decision
Mr. Sysko and his team represented me regarding a recent clearance decision. From the beginning, you could tell he had taken on many clearance cases in the past, as he was very knowledgeable of my situation and what was needed to provide a strong appeal. When I first spoke with him, Mr. Sysko was very realistic about the possible outcome, which I greatly appreciated. In the end, the clearance decision was overturned, which I attribute directly to the work conducted by Mr. Sysko and his team.
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Posted by anonymous | February 21, 2015
Psychological security adjudication case
Mr. Sysko took on our difficult psychological security adjudication case and won. He was thorough in pulling together all the facts and in bringing in expert testimony. We are glad we chose him and his team.
Posted by anonymous | February 21, 2015
Security clearance case
Mr. Sysko was very honest and forthright about my case. He knew what evidence was needed and had the right people on retainer. The appeal he wrote was comprehensive and expertly defended my interests. I would absolutely recommend him to anyone who is having their clearance revoked.
Posted by anonymous | November 24, 2014
Terrific Lawyer
A owe a great deal of gratitude to Mr. Sysco for taking my case. Through the approach he outlined and executed, my proposed clearance denial was overturned on appeal. Having observed him working my case, he is extremely knowledgeable and experienced on DOD processes and procedures and has great interpersonal and communication skills.
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Posted by anonymous | November 12, 2014
Security clearance hearing
I hired Dennis Sysko to help keep my clearance after a DUI. I was impressed by his knowledge of all the nuances with the DoD processes. He developed a strong strategy and kept me informed of all the possibilities. He did very well in preparing me for my hearing and was outstanding during it.
Posted by anonymous | November 7, 2014
Willing to take on difficult cases and work hard to win them!
My wife and I met with several attorneys that felt my security adjudication case would be too much work and difficult to win. However, Mr. Sysko believed in us and worked long and hard to present a very professional case that enabled me to retain my position of trust within the Department of Defense. My family owes the continuance of my career to his extraordinary efforts. Sincerely, Mr. DoD
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Posted by John | November 7, 2014
An Honest & Professional Counselor
Legal issues are always stressful unless you have good legal counsel. Dennis handled our issues extremely well, communicated every step of the way, and our outcome was way better than anticipated. I highly recommend Dennis as he is the best attorney we have hired in our 15+ years in business.
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  • Retainer Always
Payment methods
Cash, Check, Credit Card


AVVO RATING 9.4 (Superb)

Work Experience

  • Senior Partner
  • Henault & Sysko, Chartered
  • 1980 - Present
  • Adjunct Professor
  • University of Baltimore School of Law
  • 1999 - 2006
  • National Security Agency
  • 1970 - 1996


  • University of Baltimore School of Law
  • Juris Doctor
  • 1976
  • University of New Haven
  • B.S.E.E.
  • 1970

Legal Cases

  • Defense Office of Hearings and Appeals (DOHA) ISCR Case No. 14-03016
  • DUI/Alcohol - Administrative Judge found granting the applicant access to classified information was clearly consistent with national security.
  • Defense Office of Hearings and Appeals (DOHA) ISCR Case No. 10-08186
  • Financial - Administrative Judge found the Applicant was an acceptable security risk and granted him access to classified information.
  • Defense Office of Hearings and Appeals (DOHA) ISCR Case No. 10-03423
  • Foreign Influence/Preference - Administrative Judge found granting the applicant access to classified information was clearly consistent with national security.


  • The Society of Industrial Security Professionals
  • Member
  • 2012 - Present
  • Association of Former Intelligence Officers (AFIO)
  • Member
  • 2009 - Present
  • Fort Meade Alliance
  • Member
  • 2007 - Present
  • Chesapeake Regional Tech Council
  • Member
  • 2004 - Present
  • Anne Arundel County Bar Foundation
  • Director
  • 2002 - Present
  • District of Columbia Association
  • Member
  • 1980 - Present
  • Anne Arundel County Bar Association
  • Member
  • 1977 - Present
  • Maryland State Bar Association
  • Member
  • 1977 - Present
  • Anne Arundel County High Tech Council
  • President
  • 2002 - 2004
View all associations

Languages Spoken

  • English

Honors and Awards

  • BV Rated
  • Martindale-Hubbell
  • 2014


  • Protecting the Homeland: Balancing National Security and Individual Privacy Interests.
  • Chapter: Trends in National Security Clearances - Continuous Evaluation, Use of Social Media/Public Databases, and Insider Threats
  • 2016

Speaking Engagements

  • Anne Arundel County, MD Bar Weekend
  • Effect of Criminal Dispositions on Security Clearances
  • 2015
  • B2G
  • Perspectives on B-2-G National Security Sector
  • 2012
  • DoD Mentor-Protege Conference
  • Classified Contracts and Security Clearances
  • 2009
  • Service-Disabled Veteran-Owned Business Network
  • Security Clearances
  • 2008
View all speaking engagements

Attorney endorsements

Received (3)
Given (4)
Endorse Dennis
Government Attorney | Feb 18
Relationship: Fellow lawyer in community
"38 years of practicing law is extremely experienced. A law professor with 26 years spent with the NSA and 12 plus in private practice is a niche where few attorneys can practice due to the security clearances required. Dennis knows the law and procedure which is clearly evident in his pro bono contributions here and the fact that he teaches law. His client reviews are stellar. READ THEM! Do yourself a favor and call him for a consultation. If you are lucky he might agree to take your case. KUDOS"
Administrative law Attorney | Jan 16
Relationship: Worked together on matter
"I fully endorse Dennis Sysko. I worked with Dennis on a highly complex immigration matter that touched on national security matters. I handled the immigration aspects of the case, where he provided an exceptional expert opinion on the national security/security clearance aspect of the case. His knowledge in this niche area is unsurpassed. I believe his expert opinion won the day in our case. I enthusiastically recommend him to anyone facing a security clearance issue."
Administrative law Attorney | Nov 25
Relationship: Worked together on matter
"I endorse attorney Dennis Sysko without any reservations. I have known Dennis for 15 years as a friendly competitor, sometimes collaborator and co-counsel, valued advisor/mentor, and friend. Dennis is highly experienced in the areas of National Security Law, Administrative Law, and Business Law, to include security clearance appeals, Department of Defense (DoD) and Intelligence Community (IC) personnel matters, and DoD and IC contracting. Extremely competent, always superbly prepared, and never afraid to “think outside of the box, ” Dennis Sysko attacks each case with the intellectual rigor, imagination, due diligence, and zealousness that ensure that his clients receive the best possible legal representation."
Divorce and separation
Criminal defense
Administrative law
Administrative law