John Kenneth Zwerling
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When facing criminal charges or investigations, it is vital to have legal representation as soon as possible. A skilled criminal defense lawyer can work to protect your rights, defend your case and negotiate on your behalf to minimize consequences. At Zwerling/Citronberg, PLLC, we provide our clients with smart, strategic criminal defense representation.

We are a nationally recognized litigation firm dedicated exclusively to representing those who are accused of or are being investigated for federal or state criminal offenses at the grand jury, trial, appellate and post-conviction stages. Our attorneys advise and counsel clients regarding a wide range of legal matters, from federal drug crimes and fraud to DUI and reckless driving.
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Based in Alexandria, Zwerling/Citronberg, PLLC, is a nationally recognized litigation firm that concentrates exclusively on criminal defense. Our attorneys advise and consult on a wide range of complex criminal matters, including financial crimes and all felonies at the investigatory, trial and appellate levels in both state and federal courts.
At Zwerling/Citronberg, PLLC, we recognize that this may be most of our clients' first experiences with the criminal justice system. Applying their knowledge and experience, our lawyers guide each client through the legal process while also concentrating on developing and aggressively pursuing winning results.
John Zwerling, known as an aggressive criminal defense litigator, has a wide range of experience in complex grand jury, trial and appellate advocacy, including considerable knowledge in the area of Fourth Amendment search and seizure law and Fifth Amendment issues. After serving as a Naval Boat Group Commander in Vietnam, John graduated from the American University's Washington College of Law in 1970.
If you are facing criminal charges, it is important to get legal representation as soon as possible. An experienced criminal defense attorney can protect your rights and work to minimize consequences. At Zwerling/Citronberg, PLLC, we concentrate exclusively on defending and counseling individuals who are accused of or are being investigated for criminal offenses.
Federal drug crimes, including conspiracy, are serious offenses with harsh consequences. Even before you are charged with a crime, an experienced lawyer can protect your rights and work to minimize consequences. At Zwerling/Citronberg, PLLC, we aggressively fight for the rights of our clients from day one.
Reviews (3)
Shelby S.
Shelby S.
Nov 04, 2021
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My husband has been going through a case with the FBI since 016. Cary was always there 1phone call away if i had any questions or concerns. He helped us throughout the whole process and knew everyone in the system and helped me out big time.
He got my husband the lowest sentence possible given the severity of his case, with one of the most harsh federal judges. Throughout the 5 years of working with him we are beyond grateful for how professional, patient, and caring Cary has been with us and our family. The cost was 100% worth it to have the best representation like Zwirling&Citronberg. We are
Eric Kirschner
Eric Kirschner
Oct 30, 2020
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My ex-wife and I retained Mr. Citronberg to represent my stepson after his previous attorneys (Marina Medvin and Jesse Binnall) proved ineffective.
Cary is a first rate attorney. He is extremely professional, knowledgeable and well prepared. He speaks and writes well and is attentive to client concerns. We could not have asked for better representation for our stepson.
As a fellow attorney, I wholeheartedly recommend Mr. Citronberg. He is the kind of attorney we should all aspire to be.
Charity Phillips
Charity Phillips
Nov 10, 2016
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Incredible to watch John in action. The judge assigned to my case was known for being tough and leaning towards the prosecution... I thought I had little to no chance of being found not guilty and was prepared to appeal. However, with every point the prosecution brought up John knocked down with facts, pointing out holes in the evidence, and vivid, relatable, and impactful analogies. Well worth the money.