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James J. L. Ahern is a Partner at Fuller & Ahern, P.C., where he represents clients in criminal defense, DUI/DWAI, domestic violence, assault and felony cases, as well as personal injury matters throughout Colorado. Known for his meticulous preparation, strategic courtroom advocacy, and strong communication with clients, Mr. Ahern is frequently trusted to handle high-stakes cases where experience and attention to detail matter.
Mr. Ahern earned his B.A. from the University of Colorado Denver, graduating cum laude and with distinction, and obtained his Juris Doctor from the University of Denver Sturm College of Law in 2010.
As a former Deputy District Attorney, Mr. Ahern gained extensive courtroom and trial experience early in his career. He conducted numerous felony and misdemeanor jury trials and successfully prosecuted a wide range of cases, including first-degree murder, arson, vehicular homicide, assault, domestic violence offenses, DUI, and marijuana cultivation/possession cases. This insider perspective gives him a significant advantage when defending clients becuase he understands how prosecutors evaluate cases, negotiate plea offers, and present evidence at trial.
Mr. Ahern entered private practice in 2012 when he joined Susan Fuller & Associates, P.C. In 2022, he became a Partner in the firm, now known as Fuller & Ahern, P.C. He has dedicated his practice exclusively to litigation and regularly represents clients facing DUI/DWAI charges, domestic violence allegations, and serious felony offenses. He also handles personal injury claims, including motor-vehicle collisions and premises-liability cases.
Mr. Ahern’s work has been repeatedly recognized by national legal organizations:
The National Trial Lawyers: Top 40 Under 40 (2014–2021), honoring exceptional young trial lawyers for superior results and leadership.
The National Trial Lawyers: Top 100 Criminal Defense Lawyers (2017–present), an invitation-only distinction awarded to the premier criminal trial attorneys in each state.
Super Lawyers Colorado Rising Stars (2016–2021), an honor reserved for only 2.5% of Colorado attorneys who demonstrate excellence in the practice of law.
Clients appreciate Mr. Ahern’s responsiveness, thorough communication, and ability to break down complex legal issues into clear, actionable advice. Whether negotiating a dismissal, litigating a contested hearing, or preparing a case for trial, he is committed to achieving the best possible outcome and guiding clients through every stage of the process with professionalism and compassion.
Mr. Ahern is licensed to practice in all Colorado state courts and represents clients throughout the Denver Metro area and the State of Colorado.
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Free Consultation
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State: Colorado
Acquired: 2010
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19751 E Mainstreet Ste 270, Parker, CO, 80138
sfullerlaw.com/Attorneys/James-J-Ahern.shtml71 Client Reviews
Showing 6 - 10 of 21 reviews | Communication Style
Posted by anonymous | November 05, 2020 | Hired Attorney | Criminal Defense
Amazing one of great Lawyer's of Colorado.
I would like to share my great amazing experience with Susan Fuller & Associates, P.C. law firm. We had involved in Juvenile incident and got charged with 2 minor crimes. We never got involved in or interfered with law and justice system so we as a parents kind of scared, confused and don't know how ...
Posted by Ryan | October 15, 2020 | Hired Attorney | Criminal Defense
Thorough & Effective
I had contacted Mr. Ahern after consulting a bunch of other attorneys and knew within 5 minutes of our call that he was the only choice. I was on the receiving end of a road rage incident where I was forced to defend myself and family and was then improperly charged with assault. Based on the eviden...
Posted by anonymous | June 18, 2020 | Hired Attorney | Criminal Defense
Incredible Attorney!!!
Being charged with a crime is a serious matter and hiring the right defense attorney is a decision that you cannot afford to gamble with. After speaking to several different attorneys, I had a distinct feeling that James was the right person for the job and decided to hire him for representation in a...
Posted by Chris | August 02, 2019 | Hired Attorney | Criminal Defense
James Ahern: Honest - Devoted - Extremely Knowledgeable
I had the privilege of having James Ahern as an attorney with respect to extremely challenging criminal law matters, in multiple counties. Mr. Ahern was highly experienced, responsive, knowledgeable and honest. While working with James, I had the comfort of knowing I was in adept and trustworthy ha...
Posted by Casey | May 08, 2018 | Hired Attorney | Criminal Defense
An Excellent Attorney
I searched for an attorney after a visit from the local PD. I'm almost 40 and had never needed an attorney till now. After researching many attorney's in my area, James Ahern's credentials were some of the best. His experience on both sides of the justice system I knew were a real asset and he proved...
"I have seen James in court and have had the privilege of getting to know him over the past several years while practicing in the same area and field of law. What I have observed is James has terrific skills in the courtroom and has the respect of his colleagues and the court. I endorse him for anyone looking for a great litigator."
"James and I were opposing counsel on a divorce case with complex child related issues. He was tenacious, but fair and professional, which is what you expect from a seasoned advocate."
"James is trial tested attorney. Knowledgeable, aggressive, and treats his Client's with the respect they deserve. I enthusiastically endorse this lawyer."
"James is truly one of the best and brightest. James is on my short list of lawyers who I contact when I need expert advice. He cares about his clients, knows the law, and is masterful in the court. I can recommend James without any reservations."
"James Ahern is a natural trial attorney that is respected among professionals state wide. Mr. Ahern is detail oriented and provides highly effective advocacy in the fields of Criminal Defense and Domestic Relations. I would recommend Mr. Ahern to any person seeking the services of an aggressive attorney in the Denver Metro area."
"I have both worked with Mr. Ahern as well as been opposing counsel on matters with him. Mr. Ahern is a talented courtroom advocate with a passion for his clients, the law, and obtaining excellent outcomes. I endorse him wholeheartedly."
"James is a fantastic attorney, and I can say that as both having worked with him as a colleague and opposing counsel on a matter. He is a zealous advocate and shrewd negotiator. I highly recommend him."
"I've been fortunate enough to work with Mr. Ahern on various aspects of cases (including trial) and he is one of the best attorneys I've seen in litigation. He is great at handling cases and judges and juries are always impressed his knowledge of the law and how well he presents his arguments. I would recommend Mr. Ahern without reservation or qualification."
"Mr. Ahern is one of the best attorney's I know. His professionalism and knowledge of the law are impressive. I would hire him personally if I was in trouble with the law and needed an advocate. He is an attorney who truly cares about his clients. He has my endorsement."
"James Ahern and I had the pleasure of working together while we were at the District Attorney's office. I am not exaggerating when I say that he is one of the best trial advocates I have ever seen. Some of the most fun I had was doing trials with this man. We always tried to push each other to higher levels of artful advocacy. His knowledge of the law, care for his clients and trial skills are top notch. If you are looking for zealous advocacy, James knows no other way."
"I fully endorse this lawyer. I have tried many cases with Mr. Ahern while with the District Attorney's Office and in private practice. Mr. Ahern's trial skills are second to none. Whether facing criminal charges, a domestic relations matter, or a personal injury case James is absolutely the right man for the job. I have handed multiple sensitive criminal matters with Mr. Ahern, all of which resulted in superior results. James is absolutely a rising star in our legal community."
"Mr. Ahern's answers on Avvo are well-articulated, intelligent, and show good common sense. He is affiliated with Susan Fuller who is also an excellent attorney. I have been a judge, magistrate, prosecutor, defense attorney, general practitioner, and law professor over the past 24 years and would not hesitate to refer to Mr. Ahern."
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2021
Top 40 Under 40, National Trial Lawyers
2021
Top 100 Trial Lawyers, National Trial Lawyers
2021
Rising Star, SuperLawyers
2020
Top 40 Under 40, National Trial Lawyers
2020
Top 100 Trial Lawyers, National Trial Lawyers
2020
Rising Star, SuperLawyers
2019
Top 40 Under 40, National Trial Lawyers
2019
Top 100 Trial Lawyers, National Trial Lawyers
2019
Rising Star, SuperLawyers
2018
Top 40 Under 40, National Trial Lawyers
2018
Top 100 Trial Lawyers, National Trial Lawyers
2018
Rising Star, SuperLawyers
2017
Rising Star, Super Lawyers
2017
Top 100 Trial Lawyers, National Trial Lawyers
2017
2017 Colorado Rising Stars, SuperLawyers
2016
2016 Colorado Rising Stars, SuperLawyers
2016
Rising Star, Super Lawyers
2015
Top 40 under 40, National Trial Lawyers Association
2015
Top 10 Attorney Award, National Academy Of Personal Injury Attorneys
2014
2014 Avvo Clients' Choice Award, Avvo
2014
Top 40 under 40, National Trial Lawyers Association
2007
Academic Dean's List with Distinction, University of Colorado
2007
Cum Laude, University of Colorado
2022 - Present
Partner, Fuller & Ahern, P.C.
2012 - 2022
Attorney, Susan Fuller & Associates, P.C.
2010 - 2012
Deputy District Attorney, 4th Judicial District Attorney's Office
2016 - Present
Colorado Trial Lawyers AssociationMember
2014 - Present
National Trial Lawyers AssociationMember
2014 - Present
National Trial Lawyers Association - CriminalMember
2014 - Present
National Trial Lawyers Association - Motor VehicleMember
2012 - Present
Douglas/Elbert County Bar AssociationMember
2010 - Present
Colorado Bar AssociationMember
2009 - Present
Phi Delta Phi International Legal Honor SocietyAlumni
2010 - 2012
El Paso County Bar AssociationMember
2010
JD - Juris Doctor
2007
BA - Bachelor of Arts
English
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