Atty. Thomas J. Nellessen

Atty. Thomas J. Nellessen

Thomas J. Nellessen, Senior Attorney at Johnson Law Group, brings over 30 years of experience in divorce and family law.

Denver Denver 35 yrs experience 35 year
Call (720) 724-7207 Book Appointment

Profile Summary

About Thomas J. Nellessen at a glance

Thomas J. Nellessen is a Senior Attorney based in Denver, Colorado, practicing at Johnson Law Group, LLC. They have 35+ years of legal experience, licensed to practice since 1991. Their practice focuses on divorce, dui/dwi, drug crimes, and criminal defense. Admitted to practice in Colorado United States District Court, District of Colorado (1991). Educated at Northern Illinois University (J.D., 1990) and Metropolitan State College, Denver (B.S., 1987). Active member of Douglas/Elbert Bar Association. Serands clients in Denver, CO and the surrounding metropolitan area.

Verified attorney profile · Updated June 2026

About

  • Thomas J. Nellessen, Senior Attorney at Johnson Law Group, brings over 30 years of experience in divorce and family law
  • Tom is known for his compassionate and client-centered approach, with a focus on effective communication and prioritizing the best interests of children throughout the legal process
  • His expertise spans all areas of family law, including divorce, child custody, spousal support, asset division, and orders of protection, ensuring his clients receive personalized attention and strong legal representation at every stage
  • Tom also has experience in criminal law, which enhances his ability to navigate complex cases involving overlapping legal issues
  • Education & Professional Memberships Tom earned his Juris Doctor from Northern Illinois College of Law and has been a member of the Colorado Bar Association for over three decades
  • His commitment to excellence in family law has made him a trusted advocate, providing not only legal guidance but also emotional support to clients navigating complex family matters
  • Career Achievements Before joining Johnson Law Group, Tom founded and led the Nellessen Law Office, where he earned a reputation as one of Colorado’s premier family law attorneys
  • His deep knowledge of the legal system and unwavering dedication to client advocacy enable him to consistently achieve favorable outcomes for clients, whether through negotiation or litigation
  • Comprehensive Experience In addition to his legal practice, Tom has provided Child-Family Investigator (CFI) services across the Denver Metro area
  • After completing the state-required 40-hour CFI training program, he has applied his experience as a Guardian ad Litem and Special Advocate to deliver insightful CFI reports
  • Tom’s approach involves spending significant time with each family, thoroughly understanding their dynamics and relationships, ensuring the court receives a complete and practical picture of each family unit
  • His investigative method, focused on meaningful family interactions rather than brief testing and limited contact, provides the court with a clearer understanding of the family’s needs, always keeping the well-being of children at the forefront
  • Personal Interests Outside of his legal career, Tom enjoys traveling, attending sporting events, and spending time with his wife, Therese, and their dogs
  • He is also an avid West Coast swing dancer, having competed nationally and won several competitions, reflecting his passion for both precision and creativity in everything he does

Practice Areas Explained

Thomas J. Nellessen's Areas of Practice

Each practice area below reflects the types of cases Thomas J. Nellessen handles, with a brief overview of what that area of law covers.

Divorce

A divorce attorney guides you through property division, spousal support, custody, and the final decree — contested or uncontested.

Thomas J. Nellessen is one of 50,487 divorce attorneys indexed nationally. Browse divorce attorneys in Colorado →

DUI / DWI Defense

Find experienced DUI and DWI defense attorneys near you. Compare verified profiles, read client reviews, and consult about your case for free.

Thomas J. Nellessen is one of 29,976 dui/dwi attorneys indexed nationally. Browse dui/dwi attorneys in Colorado →

Drug Crimes

Thomas J. Nellessen is one of 6,966 drug crimes attorneys indexed nationally. Browse drug crimes attorneys in Colorado →

Criminal Defense

A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.

Thomas J. Nellessen is one of 214,270 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in Colorado →

Jurisdictional Context

Why local counsel matters in Colorado

Practicing law in Colorado. Legal matters in Colorado are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Denver are typically filed in the local municipal court or the appropriate Colorado state district court, depending on subject matter and amount in controversy. An attorney licensed in Colorado brings working knowledge of local procedural deadlines, judicial practices in this andnue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Colorado courts without local counsel or pro hac vice admission.

Looking for additional Colorado attorneys? Browse all attorneys in Denver or all attorneys in Colorado.

Frequently Asked

Common questions about Thomas J. Nellessen

Where is Thomas J. Nellessen's law office located?
Thomas J. Nellessen's law practice is located in Denver, Colorado. The firm is Johnson Law Group, LLC. You can contact the office directly through this profile page.
What practice areas does Thomas J. Nellessen handle?
Thomas J. Nellessen focuses on divorce, dui/dwi, drug crimes, criminal defense. Each practice area listed reflects experience handling cases of that type in Colorado.
How long has Thomas J. Nellessen practiced law?
Thomas J. Nellessen has 35+ years of legal experience and has been licensed since 1991.
Where did Thomas J. Nellessen go to law school?
Thomas J. Nellessen earned their education at (J.D., 1990); (B.S., 1987).
How can I contact Thomas J. Nellessen for a consultation?
You can contact Thomas J. Nellessen directly through this profile page. Click "Ask the Attorney" to submit a question, or "Schedule a Consultation" to book a meeting. Most claimed-profile attorneys respond within one business day.

Education

J.D.
Northern Illinois University
- 1990
B.S.
Metropolitan State College, Denver
- 1987

Bar Admissions

Colorado United States District Court, District of Colorado
Admitted: 1991

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