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  • Colorado

Mr. Greenstein joined the firm in 1992 and is a shareholder and director of the law firm. Before becoming a shareholder, Mr. Greenstein worked as an associate with the firm and as an associate at other Colorado law firms. Mr. Greenstein has been actively practicing law in Colorado since 1987. His 34+ year legal career has been focused primarily on family law, including divorce, prenuptial (premarital) agreements, cohabitation agreements, child custody and allocation of parental responsibility, child support, mediation, arbitration, and related matters.

Boulder, Colorado divorce lawyer Gregg Greenstein has over 34 years of experience assisting clients with all aspects of divorce and family law. Gregg works closely with clients to achieve their particular goal in a cost-effective yet decisive manner, providing counsel in resolving all issues concerning the divorce process.

We handle a wide range of family law issues including divorce, legal separation, prenuptial and postnuptial agreements, child custody and visitation (parental responsibility and parenting time), parental kidnapping, abduction and cult recovery, cohabitation agreements, mediation, arbitration, step parent and kinship adoption, restraining orders and protection orders, same sex couples rights, relocation cases, grandparent visitation and rights, and appeals.

  • St. John's University School of Law. Jamaica, New York J.D. conferred June 1987.
  • City University of New York at Queens College. Flushing, New York Bachelor of Arts, cum laude. Double major: Communications and political science.
  • Honors and Awards:  Member, National Political Science Honor Society.


  • Member, Colorado Bar Association and Boulder County Bar Association
  • Member, City of Westminster Board of Adjustment and Appeals (Zoning and Sign Code) 1996-1998


  • "Divorce Issues in Real Estate Practice," Present seminar for various Boards of REALTORS®, title companies, and Certified Divorce Real Estate Specialist certification.
  • Real Estate Divorce Specialists Training Course

  • "Testifying at Trial and Depositions,"  Boulder Association of REALTORS® Affiliates Committee,  March, 1995.
  • "What Every School Employee Should Know About Children of Divorced Parents," Seminars presented to teachers, principals, and staff to assist schools with handling issues concerning child custody, parenting time, and access to children's school records.
  • In re the Marriage of Crowder, 77 P.3d 858 (Colo. App. 2003).
  • National Casualty Co. v. Great Southwest Fire Ins. Co.,833 P.2d 741 (Colo. 1992).
  • McLarty v. United States, 784 F. Supp. 1401 (D. Minn. 1991), McLarty v. United States, 741 F. Supp. 751 (D. Minn. 1990).
  • Rennert-Diana & Co., Inc. v. Costarino, 513 N.Y.S. 2d 190 (App. Div. 1987).


  • "Child Support Continuation for Disabled Children," Colorado Lawyer, December 2011.
  • "Oral Agreements in Colorado in Colorado Divorce Cases," Trial Talk, October 1995.
  • "Blending Spousal Tort Claims and Colorado Divorce Cases," Colorado Lawyer, May 1996.
  • "Avoiding Traps in Litigation With Suspended or Dissolved Colorado Corporations,"  Trial Talk, December 1993.
  • "The Litigator's Guide to Unfair Competition in Colorado," Colorado Lawyer, January 1992.
  • Google Review By Ashley Idrees ★ ★ ★ ★ ★ It is with great pleasure that I leave a review for Gregg Greenstein. Gregg guided me during one of the the most trying and difficult times in my life. His professionalism and compassion exceeded my expectations, but most of all, his expertise and experience are what put him over the top. I felt he always gave 110%, and was always fully involved and present with every conversation, telephone call, or zoom meeting. Gregg gave me the power to make decisions that were the best for my family and I. He believed in me and my case and was unfailing in his efforts every step of the way. Court can be a nerve racking experience, but having Gregg as my attorney was a truly comforting feeling. The best choice I made was selecting Gregg as my attorney. Without any hesitation whatsoever, I would refer him to anyone who needs an attorney who will listen and fight with you, with every fiber of their being. Additionally, the staff was knowledgeable and always quick to respond.

    Google Review By Vida Keshtar ★ ★ ★ ★ ★ Dear Gregg, I can not thank you, Brittaney and Christine enough for all your help. You and your staff have been indispensable. I would like to express my heartfelt gratitude for your passion, dedication, professionalism and guidance throughout my divorce proceedings. Like I told my family and friends " I had the dream team in my corner" I wish you continued success in your practice of protecting the rights of your clients as well as the level of comfort that you and your team brings to individuals facing these trying times. May God be on your side in your effort to help the ones who seek your support. I would not hesitate to recommend you and your team to any friends and family members looking for an experienced and caring Divorce Attorney.

    Google Review By Scott E ★ ★ ★ ★ ★ Gregg Greenstein helped me with two matters in the span of a year, and it was clear from the beginning he moves fast and efficiently. Gregg provided expert legal counsel and had a solid team supporting him. The work was done right and on time, and honestly if he wasn’t on top of his stuff they way he is it would have cost me more than more than it did. All in all a good experience.

    Google Review By A Coloma ★ ★ ★ ★ ★ FIVE STARS is not enough to describe the great job my attorney Mr. Gregg Greenstein of FJGG did with my divorce. I was terrified to file but after meeting Gregg and his wonderful law team, my worries melted away. Gregg kept me informed and resolved all my concerns with the utmost dignity and respect. He remained thoughtful and compassionate to my special needs while staying completely focused on getting the job done in the most professional, timely and organized manner. Gregg Greenstein and his firm provided quick responses and were available every time I needed them. And before I knew it, my divorce was over! I’m extremely satisfied. Mr. Greenstein is a very intelligent, kind and hard-working attorney who I highly, and gladly, recommend to others.

    Google Review By Paul Seiwald ★ ★ ★ ★ ★ Deciding to get a Divorce was a tough thing. I had no idea what I needed to do. A friend recommended FJG&G to me. He knew I wanted a Fair, straight forward and Honest attorney. Which was what I got from the time I walked in. My team off, Brittaney, Gregg and Christine were open about the process and advised it was not going to be pleasant, but everything would be done right and complete. They were professional all the way through. They would not play down to the level of the other side and present several fair settlements which were turned down. Unfortunately it had to go to court. Brittaney prepared me and put a strong case together and in the end I could not be more pleased. The professionalism was far beyond my original expectations. I would recommend them for any law services they cover, if you want a firm that will make sure everything is cover, thoroughly.

    Google Review By Morten Roising ★ ★ ★ ★ ★ Going through our divorce process is one of the hardest and most emotional experiences I have ever had. After my x-spouse engaged a law firm I felt the need to do the same. I ended up with the most remarkable Dream Team of Brittaney D. McGinnis, Christine J. Hickey, and Gregg A. Greenstein. After getting to know them better I decided to have Brittaney run my case. Quite a gamble, as she was up against my x-spouse's very expensive lawyer with 20 years of experience, but my intuition proved absolutely right. As in the Pepsi/Coke war, the slogan "We Try harder" has never been more true. Brittaney was like a lioness during this whole process, really looking after me. Not only was she a remarkably professional, effective, and unbelievably responsive lawyer - she brought integrity, compassion, and understanding to the process and I always felt understood and listened to - and I was not an easy client. I know Brittaney & team were extremely busy with other cases, but it be evenings, nights, or mornings, Brittaney always found time to respond and guide me in a way my X-spouse never got to experience. I truly felt like I was their only client for the 8 months the process lasted! My X-spouse and I finally came to an agreement before going to court. I always felt Brittaney & team tried to support me in making this happen, while I had the clear sense my X-spouse's lawyer did anything she could to drag it out and ultimately bring it to court, while the invoices kept coming. Throughout the process my X-spouse started to feel the same about her representation, and I don't think there could be a more powerful compliment to my Dream Team, when she stated: "If I was ever to go through a divorce again, I would hire your Dream Team". Thank God I would not be on the receiving end if that was ever to happen again:-). As my X-spouse and I went through the final stages of our settlement, she asked me if we could just use my Dream Team, and eliminate her lawyer. I will always remain extremely grateful for the way these people stuck with me all the way through the divorce process.

    Google Review By Jon Rice ★ ★ ★ ★ ★ Gregg Greenstein and Sylvia Brownfield have worked with us for two years and have consistently demonstrated the highest levels of professionalism, concern for the success of our litigation, and sensitivity to cost and time. Their thoughtful and accurate legal advice, along with Christine Hickey's terrific follow-through, has been invaluable to us. We recommend them, and this firm, without hesitation if you're seeking a quality family lawyer.

    Google Review By Robert Thomas ★ ★ ★ ★ ★ Gregg Greenstien is an amazing attorney, a true professional. He provided thoroughly prepared options that help with all the decisions during the divorce process . His knowledge & experience guided me to a fair and prompt separation agreement/divorce . He and his team did and Excellent job. I absolutely recommend his legal services.


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    Who Gets to Claim Child on Taxes After a Divorce?

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    Same Sex Marriages and Maintenance

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    Gregg A. Greenstein is a shareholder in the law firm of Frascona, Joiner, Goodman and Greenstein, P.C., a Colorado law firm. His practice areas include Real EstateLitigationFamily LawDivorce, and AdoptionContact Gregg Greenstein.

    Disclaimer — Content is general information only. Information is not provided as advice for a specific matter, nor does its publication create an attorney-client relationship. Laws vary from one state to another. For legal advice on a specific matter, consult an attorney.

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