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About me

Managing Partner of Thyden Gross & Callahan, LLP, a law firm in Chevy Chase, Maryland.  Mediator, collaborative lawyer and arbitrator.  Author or co-author of three books, “File for Divorce in Maryland, Virginia and the District of Columbia”, “Money and Divorce” and “Fathers’ Rights (The Best Interest of Your Child Includes You)”.  Editor of two blogs, “Maryland Divorce Legal Crier” and “Fathers’ Rights (Not Just Every Other Weekend)”.  Speaker on family law at various seminars and appearances on television and radio.  Selected among top lawyers in Maryland and DC by Super Lawyers Magazine and Washingtonian Magazine, rated “Superb” by and “av” by Martindale-Hubbell.



You can read more of my life experiences if you want to know how I got here.  I was born in Jefferson City, Missouri, and grew up in Hannibal, Missouri, boyhood home of Mark Twain.  When I was 16, I took a correspondence course and passed a government test to obtain a First Class Radio Telephone Operator License, and got a job as an announcer, news reporter and engineer at my dad’s radio station.

I studied Chemical Engineering at the University of Missouri in Columbia, and graduated in 1970 with a BSChE.  Procter & Gamble hired me to work in its International Division in Cincinnati, Ohio.  I was there for about a year when Uncle Sam drafted me for the Viet Nam War.  I spent a year producing television shows for the Signal Corp. at Fort Gordon, Georgia, and another year working on long range patrol rations as a chemical engineer at the U.S. Army Labs in Natick, Massachusetts.

When I got out of the army, I went to law school at the University of Missouri in Columbia, where I made the law review and clerked for the Public Defender.  I graduated with a JD in 1975.  The Federal Communications hired me to come to Washington, DC, and work as an attorney in the Broadcast Division.  After two years, Satellite Business Systems, a partnership of IBM, Comsat and Aetna.  During that time, I earned a Master of Laws in Taxation from Georgetown University in 1982.

Trammel, Rand, Nathan & Lincoln hired me from Satellite Business Systems after two years, and I set up my own practice a year after that.  I merged that firm into Amram, Hahn & Gross where I was the managing partner and worked on real estate tax appeals.  Whiteford, Taylor and Preston hired me from that firm, and I co-founded Thyden Gross & Callahan, LLP, a year later.

I am past president of Metropolitan Washington Mensa and the Collaborative Law Society.  I have served on the Board of Directors of Sheet Metal Manufacturing, Inc., Affiliated Community Counselors, Inc., and the DC Capitols Track and Field Club.  I play racketball and I live in Chevy Chase, Maryland, with my wife, two sons and two cats.


Practice areas


  1. Divorce: 70%
  2. Business: 20%
  3. Family: 10%


Payment types:

Cash, Check, Credit card

Attorney endorsements

10 total 

Are you an attorney? Endorse this lawyer

  • Dawn Elaine Bowie

    Jim is a compassionate human being and a genuine counselor at law. I learned a great deal from him that has been helpful to me in my practice.


    Dawn Bowie Divorce and separation Attorney
    Relationship: Worked for lawyer

  • Dana Whitehead Mckee

    I endorse this lawyer's work. Jim is a knowledgeable and well respected family law attorney. As a fellow family law attorney, I look forward to this weekly newsletter - Divorce & Family Law - with his updates on the law and his insights regarding the impact that divorce and separation have on individuals.


    Dana Mckee Divorce and separation Attorney
    Relationship: Fellow lawyer in community

Contact info


4601 Willard Avenue
Chevy Chase, MD, 20815-4639


DCActive 197607/10/2016
MOInactive voluntarily197501/08/2013
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Maryland SuperlawyersLaw & Politics Magazine2016
Washington DC SuperlawyersLaw & Politics Media2016
Maryland SuperlawyersLaw & Politics Magazine2015
Washington DC SuperlawyersLaw & Politics Magazine2015
Washington DC SuperlawyersLaw & Politics Magazine2014
Maryland SuperlawyersLaw & Politics Magazine2014
Washington DC Super LawyersLaw & Politics Magazine2013
Maryland Super LawyersLaw & Politics Magazine2013
Washington DC Super LawyersLaw & Politics Magazine2012
Maryland Super LawyersLaw & Politics Magazine2012
Maryland Super LawyersLaw & Politics Magazine2010
Washington DC Super LawyersLaw & Politics Magazine2010
Maryland Super LawyersLaw & Politics Magazine2009
Washington DC Super LawyersLaw & Politics Magazine2009
Top Divorce AttorneysWashingtonian Magazine2009
Washington DC Super LawyersLaw & Politics Magazine2008
Maryland Super LawyersLaw & Politics Magazine2008
Washington DC Super LawyersLaw & Politics Magazine2007
Maryland Super LawyersLaw & Politics Magazine2007
Quality of LifeBar Association of DC2006
AV Preeminent 5.0 out of 5 Peer Review RatedMartindale-Hubbell1988
Work experience
TitleCompany nameDuration
Managing PartnerTHYDEN GROSS AND CALLAHAN, LLP1990 - Present
Of CounselWhiteford, Taylor & Preston1989 - 1990
PartnerAmram, Hahn & Gross, PC1983 - 1989
AttorneySatellite Business Systems1977 - 1979
AttorneyFederal Communications Commission1975 - 1977
Association namePosition nameDuration
Maryland State Bar AssociationN/A1994 - Present
Montgomery County Bar AssociationN/A1994 - Present
District of Columbia BarN/A1976 - Present
Collaborative Law AssociationFounding Member and Past President2002 - 2008
Metropolitan Washington MensaPast President1982 - 2008
Bar Association of the District of ColumbiaN/A1976 - 2008
Publication nameTitleDate
ApressIt's Splitsville (Surviving Your Divorce)2013
Sphinx Legal (Second Edition)File for Divorce in Maryland, Virginia and the District of Columbia2006
Sphinx PublishingMoney and Divorce2006
Sphinx Publishing (Second Edition)Fathers' Rights (The Best Interest of Your Child Includes You)2006
School nameMajorDegreeGraduated
Georgetown University Law CenterTaxationLL.M - Master of Laws1982
University of Missouri - Columbia School of LawLawJD - Juris Doctor1975
University of Missouri, ColumbiaChemical EngineeringBS - Bachelor of Science1970
Speaking engagements
Conference nameTitleDate
KMOX RadioDivorce in a Recession2009
Comission for WomenPro Se Divorce2009
Comission for WomenNegotiating a Separation Agreement with Your Spouse2009