Skip to main content

Mark Russell Clasby

Child custody Attorney at Dallas, TX

5.0   6 reviews

Call and speak with several attorneys to find best fit for your specific legal issue.
Can't find what you are looking for?
Avvo has 97% of all lawyers in the US.
Find the best ones near you.
Find Nearby Lawyers

About Mark

Learn Mark’s areas of practice.

Practice areas
  1. Child custody
    Original Suits Affecting Parent-Child Relationships, Modifications and Enforcements.

    9 years

  2. Divorce and separation
    Annulments, Divorces with Children and Divorces without Children.

    9 years

  3. Family
    Miscellaneous family law cases such as Amicus, Attorney Ad Litem, Guardian Ad Litem, Family access, Parental Terminations and Mediations.

    9 years

  4. Adoption
    New Spouse, Sibling, Foster Parent, Step-Parent, Grandparent and all other persons looking to adopt a child in their life.

    9 years

  5. Child support
    OAG cases, Modifications and Enforcements.

    9 years

I practice exclusively family law. This includes adoptions, amicus or ad litem work, mediations, child support, suits affecting the parent-child relationship (SAPCR), divorces, premarital agreements and other family matters.  

I find myself in the Courtroom quite often and am an experienced litigator. While I wish I was in Court exclusively to finalize adoptions, the reality is, I am there because a story needs to be told. I attempt to resolve all cases without the need for court intervention. When a case goes to trial, I work with my client to ensure they are prepared for the road ahead. This requires a thorough gameplan, knowledge of the facts, evidence and most importantly, my client's individual story.

Licensed for 8 years
State TX
Status Eligible to Practice in Texas
Acquired 2014
Updated 01/23/2023

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

Contact Mark

Similar lawyers nearby

Law Office of Jodi McShan, PLLC
4144 North Central Expy.
Suite 1000
Dallas, TX, 75204


5.0 / 5.0
  6 customer reviews
5 Star
4 Star
3 Star
2 Star
1 Star
Posted by Allison | June 4, 2020
This review is from a person who hired this attorney.
| Hired Attorney
Fantastic Attorney
Mark handled a high conflict and very stressful case with ease, grace and honor. I feel very blessed to have been represented by such an upstanding person who fought and cared for me every step of the way!
Posted by anonymous | May 9, 2017
This review is from a person who hired this attorney.
| Hired Attorney
Extremely knowledgeable of the law
I was very pleased with the effort and care he showed me and I will definitely use his services again, should I want to move forward in my efforts to visit my grandchildren.
Posted by Peter | February 23, 2017
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Outstanding Man with a big heart that happens to also be a lawyer
Mark Clasby is phenomenal! I have known him for several years and he is not only an excellent attorney but has an excellent rapport and a kind spirit that makes you feel comfortable working with him. He connects with you and makes what can be a difficult process more comforting. He truly cares about the client. Mark really wants you to be happy and satisfied with her representation.
Read less
Posted by JC | February 21, 2017
This review is from a potential client who consulted with this attorney.
| Consulted Attorney
Mark Clasby is fantastic!
Excellent person and attorney; very competent and devoted to his clients; absolutely recommend
Posted by Julio Jr. | September 8, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Best decision of my life and child
Mark Clasby was one the best decisions I've made in my life because he gave me my life back. Getting joint custody with no child support involved has given a whole new life but ultimately the best decision for my son. Mark is a highly intelligent person who truly cares about his clients to the point where you feel that it's a family member guiding you and helping you get the best result possible. I highly recommend Mark to anyone needing family solutions. Amazing attorney and person in general, you will be forever grateful having him on YOUR side!
Read less
Posted by Jessica | August 29, 2016
This review is from a person who hired this attorney.
| Hired Attorney
Excellent attorney!!
Mark Clasby is such an excellent , caring and trust worthy family law attorney. Wisely guided and directed me through every step of my divorce. He listened and truly cares about each of his clients. His approach with his clients makes you feel different than most. Always making sure mine and my children's best interest and safety was put first. So thankfully to have him through that experience. With the best outcome possible! Will continue to recommend Mark to anyone looking for exceptional counsel! Thank you!
Read less
View less reviews


  • Hourly Rates $ 250-300 per hour
  • Retainer Sometimes
Payment methods
Cash, Check, Credit Card


AVVO RATING 8.5 (Excellent)

Work Experience

  • Associate
  • Law Office of Jodi McShan, PLLC
  • 2017 - Present
  • Attorney
  • O'Neil Wysocki, P.C.
  • 2016 - 2017
  • Attorney & Counselor
  • Law Office of Mark R. Clasby
  • 2014 - 2016
  • Law Clerk
  • Simon, Eddins & Greenstone, LLP
  • 2010 - 2013
  • Project Manager
  • Equivalent Data
  • 2005 - 2009
  • Financial Analyst
  • A.G. Edwards & Sons
  • 2004 - 2004
View all work experience


  • Texas A&M School of Law
  • Doctor of Jurisprudence/Juris Doctor (J.D.)
  • 2014
  • Austin College
  • BA - Bachelor of Arts
  • 2004


  • Legacy Family Court Foundation
  • Board of Directors
  • 2019 - Present
  • Tarrant County Bar Association
  • Member
  • 2018 - Present
  • Dallas Association of Young Lawyers Foundation
  • Fellow
  • 2016 - Present
  • State Bar of Texas
  • 2014 - Present
  • Texas Young Lawyers Association
  • 2014 - Present
  • Dallas Bar Association
  • Member
  • 2014 - Present
  • Dallas Association of Young Lawyers
  • Member
  • 2012 - Present
  • Dallas Association of Young Lawyers
  • Leadership Class
  • 2016 - 2017
  • Operation: Heal Our Heroes
  • Board of Directors
  • 2015 - 2018
View all associations

Languages Spoken

  • English


Speaking Engagements

  • Mental Health Panel
  • The Pressures of Law School & Practicing Law
  • 2016
  • Restorative Justice Panel
  • Restorative Justice
  • 2014

Attorney endorsements

Received (8)
Given (23)
Endorse Mark
Family Attorney | Jan 29
Relationship: Opposing Counsel on matter
"I endorse this lawyer. Mark is always professional, courteous, and kind. His approach to cases is practical and collaborative. His focus on solutions helps clients resolve cases. Mark is an excellent attorney that I would refer to anyone."
Family Attorney | Jul 13
Relationship: Fellow lawyer in community
"I have know Mark Clasby for years now, and his reputation in the community is sterling. He is a skilled attorney who shines especially bright with a potent ability to communicate, negotiate and litigate in every environment."
Family Attorney | Jul 13
Relationship: Fellow lawyer in community
"An excellent advocate for his clients and professional at all levels."
Family Attorney | Mar 15
Relationship: Worked together on matter
"I wholeheartedly endorse Mark. He is a consummate professional and dedicated family lawyer who cares deeply about his clients and their families."
Family Attorney | Feb 07
Relationship: Worked together on matter
"I endorse this lawyer. I had the recent pleasure of working with Mark on a case. He was not only knowledgeable, but passionate about the work he was doing for our client. I would absolutely recommend him."
Unknown Attorney | Aug 31
Relationship: Fellow lawyer in community
"I endorse this lawyer."
Family Attorney | Aug 26
Relationship: Supervised lawyer
"Mark is a superstar lawyer in the making. He has a good sense of justice and persuasion. When a case needs settling, Mark can get it done. But he isn't afraid to litigate when necessary."
Unknown Attorney | Apr 22
Relationship: Fellow lawyer in community
"Mark is not only an outstanding lawyer, he is a fantastic person. He is one of the smartest lawyers in North Texas and a true asset to the legal community. I whole-heartedly endorse Mark Clasby."
View more endorsements

Avvo Contributions

This attorney hasn't created any legal answers in Q&A or legal guides recently on Avvo.

Dallas Child custody Lawyer Mark Russell Clasby
Mark Russell Clasby
Child custody Attorney
Dallas, TX
Licensed for 8 years