Sergei B Thomas

Sergei B Thomas

4.1
Rating: 8.9

Licensed for 35 years

Child custody Lawyer at Denver, CO
Practice Areas: Child Custody, Divorce & Separation, Guardianship ... +2 more

1407 Larimer Street, Suite 206, Denver, CO

About Sergei

Practice Areas

5

Practice Areas

Child Custody 40%

Parenting time disputes in cases involving divorce, allocation of parental responsibilities, grandparent rights, motions to restrict parenting time, and psychological parent cases to resolve parenting schedules, child support, allocation of the tax dependency exemption, decision making and payment of unisured medical or extracurricular expenses. Often such cases involve use of experts appointed by the Court to investigate the issues in the case. to address parenting disputes.

19 years

40%
Divorce and Separation 40%

Dissolution of marriage, legal separation, with issues of marital assets (stocks, investment and retirement accounts, separate property that has increased in value during the marriage) and debt division,

19 years

40%
Guardianship 10%

For cases in which a sole parent has passed away, has been hospitalized or may incapacitated, or where parents may have substance abuse or mental health issues rendering them incapable of safely caring for the minor children in their custody, or where

19 years

10%
Adoption 5%

Stepparent, kinship,and second parent adoptions with the accompanying relinquishment proceedings.

19 years

5%
Marriage and Prenuptials 5%

Prenuptial agreements as well as postnuptial agreements whch are drafted in order to protect the interests of the parties in the event that a marriage is sought to be dissolved.

19 years

5%

Fees and Rates

Cost

Free Consultation

$0 first 30 minutes

Hourly Rates

$ 250-250 per hour

Retainer

Always


Payment Methods

  • Cash
  • Check
  • Credit Card

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Licenses

Licensed in Colorado for 35 years

State: Colorado

Acquired: 1990

Active

No misconduct found

Location

Thomas Law Group, P.C.

1407 Larimer Street, Suite 206, Denver, CO, 80202

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Sergei B Thomas's Reviews

Avvo Review Score

4.1 /5.0

13 Client Reviews

Filter Avvo Reviews (13) Refine reviews to match your needs. Use the filters to quickly surface reviews that align with your case or priorities.

Showing 1 - 3 of 3 reviews | Practice Area Knowledge

Posted by Alison | April 24, 2025 | Hired Attorney | Employment & Labor

Extremely Knowledgeable and Professional Attorney

Sergei was extremely knowledgeable and professional. I'm an HR professional based in WA state but also have employees in CO state and I needed an experienced attorney to help with an employee relations issue. Sergei and his staff made me feel comfortable right from the start. He explained the process... thoroughly and in a way that I could understand. I couldn't have resolved the case successfully without him.

Posted by Sherri | October 10, 2021 | Hired Attorney | Child Custody

The best lawyer

He told me exactly what was going to happen and he was by far the best lawyer for my custody case.. He is knowledgeable and knows what he is talking about. Other lawyers told me I would lose but I won thanks to him. Very honest lawyer. If you need a great lawyer he is him.

Posted by Dawn S. | June 25, 2018 | Hired Attorney | Family

Solid representation in my case. Decisive Victory!

Sergei represented me in a contempt case against my ex husband. His knowledge was very thorough and his guidance was accurate and informed. My case lasted four months and there was a lot of back and forth between Sergei and the other Lawyer. Sergei maintained my position and stood solid ground. The ...case went to court where his knowledge, demeanor and professionalism decisively won my case. Sergei, I cannot thank you enough for your guidance and support through this challenging time.

See All Client Reviews

Sergei B Thomas's Lawyer Endorsements

Endorse Sergei
Maha Kamal headshot
Maha Kamal

Family lawyer | Jan 18

Relationship: Worked together on matter

"I endorse this lawyer. I had the pleasure of working with Mr. Thomas at our previous law firm. He's incredibly knowledgeable of the law and also incredibly experienced. He's also very thoughtful, putting his clients' needs and goals first. I wouldn't hesitate recommending him to anyone. We're lucky to have him as part of our Bar."

Ronald G. Walls II headshot
Ronald Walls

Family lawyer | Jan 18

Relationship: Fellow lawyer in community

"I have had the privilege of working with Mr. Thomas. He is well versed in all aspects of the law. What is truly striking about Mr. Thomas is his empathy for his clients. He will certainly present clients with well researched options and case strategies, however, he will always keep their best interests at heart. I highly recommend him for any family law matter."

Autumn Charlie Scardina headshot
Autumn Scardina

Child custody lawyer | Oct 14

Relationship: Opposing Counsel on matter

"I endorse this lawyer."

Zachary Alexander Chapman headshot
Zachary Chapman

Child custody lawyer | Mar 17

Relationship: Co-worker

"Mr. Thomas is a widely respected attorney both in his current office and throughout the Denver Metro Area. His knowledge of all aspects relating to Domestic Relations and Juvenile law is phenomenal and his ability to strategically plan and execute has awarded him with many favorable outcomes and satisfied clients."

Rachel L. Young headshot
Rachel Young

Unknown lawyer | Mar 17

Relationship: Co-worker

"Sergei is a dedicated and diligent attorney. He zealously represents his client while maintaining high standards of compassion and professionalism. I recommend Sergei as a family law attorney."

Jason A. Marquez headshot
Jason Marquez

Divorce and separation lawyer | Mar 14

Relationship: Supervised lawyer

"I endorse this lawyer."

Robert Samuel Willett headshot
Robert Willett

Criminal defense lawyer | Mar 04

Relationship: Fellow lawyer in community

"I endorse this lawyer. I have know Serge for 20 years, He was a Deputy DA when I was a cop. I am now an attorney. Serge is skilled, dedicated, hard-working, and possesses sterling integrity. I highly endorse him in all areas of practice."

John Paul Prentiss headshot
John Prentiss

Family lawyer | Mar 04

Relationship: Co-worker

"I endorse this lawyer. Sergei is knowledgeable, experienced, and great to work with. You couldn't ask for a better attorney."

Christopher Robert Basler headshot
Christopher Basler

Family lawyer | Jan 14

Relationship: Co-worker

"I endorse this lawyer. Mr. Thomas is a kind hearted and empathetic attorney that works diligently for the best interests of his clients and their children. Mr. Thomas is a highly skilled litigator and well respected in the community."

View All Endorsements
Chris Halsor headshot
Chris Halsor

DUI and DWI lawyer

Maha Kamal headshot
Maha Kamal

Family lawyer

Ronald G. Walls II headshot
Ronald Walls

Family lawyer

Zachary Alexander Chapman headshot
Zachary Chapman

Family lawyer

Rachel L. Young headshot
Rachel Young

Family lawyer

John Paul Prentiss headshot
John Prentiss

Family lawyer

Jason A. Marquez headshot
Jason Marquez

Family lawyer

Russell Stuart Ray headshot
Russell Ray

Criminal defense lawyer

Rachel Anne Markel Catt headshot
Rachel Catt

Family lawyer

Experience

Rating:  8.9 (Excellent)

Honors

2016

Distinguished, Martindale-Hubbell

Work Experience

2016 - Present

Owner, Thomas Law Group, P.C.

2014 - Present

Senior Associate, Johnson Marquez Legal Group

2006 - 2014

Associate, Matthews & Matthews, P.C.

1990 - 2006

Deputy District Attorney, Jefferson County District Attorney's Office

1989 - 1990

Law Clinic Participant, Washburn University School Of Law

1988 - 1990

Legal Internal, 1st Judicial District of Jefferson County

Associations

2015 - Present

Sam Cary Bar Association

Member

2006 - Present

Adams County Bar Association

Member

2006 - Present

Colorado Bar Association

Member

1999 - 2006

Colorado Appointed Special Advocates

Board of Directors

1999 - 2006

Jefferson County Juvenile Review Board

Board Member

Education

1990

Washburn University School of Law

JD - Juris Doctor

1986

University of Colorado - Boulder

Bachelor of Arts

Languages

English

Spanish

Activity

Avvo Rating

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Avvo Rating Levels
10.0 - 9.0 Superb8.9 - 8.0 Excellent7.9 - 7.0 Very Good6.9 - 6.0 Good5.9 - 5.0 Average4.9 - 4.0 Concern3.9 - 3.0 Caution2.9 - 2.0 Strong Caution1.9 - 1.0 Extreme Caution