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James A. Lionberger

Mediation Attorney at Longmont, CO

5.0   7 reviews

also known as Jim Lionberger

  • State Years
    Colorado - CO 41 years
    Missouri - MO 42 years
  • Licensed for 41 years
    State CO
    Acquired 1982
    Active No misconduct found
  • Licensed for 42 years
    State MO
    Acquired 1981
    Inactive No misconduct found

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

About James

Learn James’s areas of practice.

Practice area
  1. Mediation
    Mediation/Arbitration services

    31 years, 2,300 cases

I have practiced in Boulder County for thirty-five (35) years, and have served as a mediator for twenty-five (25) years.  I have appeared before the Court thousands of times, and have served as a mediator in more than a thousand cases.  But this experience has convinced me that the last choice in any family law matter should be to turn the decision over to the Court. Although judges are hard-working and well-meaning, trying their best to enter just verdicts, they are mere mortals nonetheless. Despite their best efforts, they often enter awards that do not seem “fair” to either of the litigants.  Thus, I encourage my clients to take all reasonable efforts to negotiate a mutually agreeable resolution of their case that relieves them of the anxiety, hostility, and substantial legal costs associated with taking a matter all the way to trial. However, if a reasonable settlement cannot be negotiated, I am experienced, willing and able to present my client's case to the Court with persuasion and conviction.  

Contact James

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James A. Lionberger
Suite B
2907 17th Ave.
Longmont, CO, 80503


5.0 / 5.0
  7 customer reviews
5 Star
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1 Star
Posted by Rick | September 4, 2018
This review is from a person who hired this attorney.
| Hired Attorney
Great Communication and passion to serve
When I first hired James Lionberger my case, at that time, was fairly cut and dry. When it became complicated, Mr. Lionberger and his staff took the bull by the horns and drove my case to closure. His staff are great communicators by keeping me informed about every little detail. I would highly recommend the law firm of James Lionberger.
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Posted by Wileen | July 30, 2018
This review is from a person who hired this attorney.
| Hired Attorney
Jim Lionberger is an example of what Family Lawyers should be
I am so grateful to have found and been accepted as a client by this firm! I needed a divorce from a volatile and unpredictable person. Jim and Diana kept everything very professional and as calm as possible. Even from our first interview Jim was concerned with my safety, he spent his own time going over safety practices with me. Throughout the process Jim kept me current with all events. He prepared me and my case for the worst scenario to get the best results, should that happen. He explained the laws that were applicable and how a judge would view my case. Luckily the other party was a final no-show and we got a best scenario result. Regarding fees and billing, Jim and Diana kept very accurate accounting of time and effort spent on my behalf and all were included in my billing statements. I really expected the costs to be higher and was worrying about how I was going to afford them. Due to their efficiency the costs were more than reasonable and I am able to budget them in. I disagree with a previous reviewer who says Jim is only after $$$'s, Jim does his business to help people and asks only to paid commensurately . He is honest and up front about his fees and intentions. I know that he spent unpaid time on the phone and in person with me. If I could I would rate this firm 10 stars out of 5!!
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Posted by Kevan | March 14, 2018
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Overall great guy
I went in to see Mr. Lionberger for a case, while also having a different attorney for an unrelated case. I wish I had not already retained an attorney for my other case when I walked out of his office so that he would take over it as well. I even thought about forfeiting my retainer on the other attorney very heavily. I highly recommend.
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Posted by Becky | July 23, 2017
This review is from a person who hired this attorney.
| Hired Attorney
A Great Attorney
Not only is Jim an extraordinarily knowledgeable and experienced attorney, he is an extremely patient, kind and honest person. I was very satisfied with his representation. I would and have referred others to him without hesitation.
Posted by anonymous | July 22, 2017
This review is from a person who hired this attorney.
| Hired Attorney
Wonderful wonderful human being! Did a wonderful job and had my best interest at heart!
Posted by Regina | July 21, 2017
This review is from a person who hired this attorney.
| Hired Attorney
Mr Lionberger has helped me on many cases over the last 25+years. I am a property manager and he's done FEDs for me plus consulting on my leases.
Posted by anonymous | July 21, 2017
This review is from a person who hired this attorney.
| Hired Attorney
Divorce Lawyer
Jim got me more than I expected out of the divorce. He opened my eyes to what I could get.
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  • Hourly Rates $ 195-300 per hour
Payment methods
Cash, Check, Credit Card


AVVO RATING 8.0 (Excellent)

Work Experience

  • Owner
  • Law Office of James A. Lionberger
  • 1989 - Present
  • Owner
  • Hopp, Carlson & Beckmann, PC
  • 1982 - 1989
  • Law Clerk to Hon. J.P. Morgan (dec.)
  • Missouri Supreme Court
  • 1981 - 1982
  • Law Clerk
  • Shirkey and Associates
  • 1979 - 1980
View all work experience


  • University of Missouri - Columbia
  • JD - Juris Doctor
  • 1981
  • University of Missouri
  • BS - Bachelor of Science
  • 1978


  • Colorado Bar Association
  • Member
  • 1982 - Present
  • Boulder County Bar Association
  • Member
  • 1982 - Present

Languages Spoken

  • English

Honors and Awards

  • Peer Review Rated
  • Martindale-Hubbell
  • 2017

Speaking Engagements

  • Paralegal Section
  • Basics of Domestic Law Mediation
  • 2018
  • Colorado Family Support Council Annual Conference
  • Negotiation/Mediation Skills
  • 2013

Attorney endorsements

Received (2)
Given (6)
Endorse James
Mediation Attorney | Aug 31
Relationship: Worked together on matter
"I endorse this lawyer. Jim Lionberger doesn't waste people's time with listening to himself talk. He is exceptionally knowledgeable about the court system and judges and, based on his wealth of experience, he is our go-to mediator in the Boulder area."
Mediation Attorney | May 27
Relationship: Worked together on matter
"James Lionberger exemplifies the very best attributes of an active attorney and displays a high level of professionalism, confidence and skill. In fact, his manner and professionalism as a mediator are at a standard to which I and others should aspire. Mr. Lionberger is an intelligent and well-prepared mediator. He works hard to maintain positive relationships with judges and a working knowledge of the courts processes. Mr. Lionberger is an excellent mediator and I recommend him wholeheartedly."