Our Team

Genuine Representation from One of Denver's Most Trusted Law Firms

Founding Attorney

Jill M. Jackson is one of Colorado’s most trusted and respected criminal defense attorneys, known for her fearless litigation style, unwavering client advocacy, and deep commitment to justice. 

Jill’s dedication to trial advocacy began in law school, where she excelled in trial practice, won multiple mock trial competitions, and earned first place for her moot court oral argument. She launched her career at the Washtenaw County Public Defender’s Office in Ann Arbor, Michigan, where she quickly earned a reputation for tenacity, preparation, and genuine compassion for her clients.

Jill has built broad experience handling everything from major felonies— including sexual assault, attempted murder, complex organized crime and COCCA matters — to DUI, domestic violence, and misdemeanor cases across Colorado. Jill has been recognized by The National Trial Lawyers as a Top 100 Trial Attorney and Top 40 Under 40 Trial Attorney, and was honored by the American Institute of Criminal Lawyers as one of the 10 Best Female Attorneys. She is also certified in Standardized Field Sobriety Testing (SFST), a key advantage in DUI litigation.

Jill founded the Law Office of Jill M. Jackson on the belief that clients deserve more than legal representation—they deserve personal attention, clear communication, and a defense strategy tailored to the unique circumstances of their lives. Her client-centered philosophy continues to shape every part of the firm. 

Today, Jill leads a growing team of dedicated criminal defense professionals who share her commitment to excellence and compassionate advocacy. Together, they work tirelessly to serve the firm’s clients and uphold the highest standards of criminal defense practice. 

Associate Attorney

Sierra Motiee-Moore is an Associate Attorney with a primary focus on criminal defense, because she believes everyone deserves an advocate who will fight to protect their rights. Sierra is from East Tennessee originally, and graduated from the University of Tennessee twice; first with her bachelor’s degree in Political Science and Public Health and then again after completing law school.

As an AmeriCorps alum, Sierra has a background in education and outreach, and she has long been involved in client-facing work. She always puts a focus on making sure that you understand the process as you go through it, so that you know what to expect at every step. Sierra has experience working on cases that range from misdemeanor DUIs and Probation Revocations to Felony drug charges and attempted homicide.

Outside of work, Sierra has a special fondness for the outdoors - this is what brought her to Colorado! She enjoys movies and reading, as well as spending time in the kitchen trying new recipes.

Legal Assistant

Tessa Post is a Legal Assistant at The Law Office of Jill M. Jackson. Originally from Maine, she has called Denver home for the past 15 years. Tessa holds a bachelor’s degree in Technical and Business Administration and brings a diverse professional background to her role.

Before joining the firm, Tessa worked for a handful of non-profit organizations throughout the Denver Metro Area, where she specialized in planning and managing large-scale fundraising events. Most recently, she served as the Assistant Director for a HOA community, gaining valuable experience in administrative operations and community relations.

Tessa enjoys the fast-paced, dynamic environment of criminal defense law. Her strong communication skills, attention to detail, along with her passion for client advocacy make her an integral part of the legal team. With a solid foundation in administrative support and a genuine desire to help others, she is both reliable and resourceful team member.

Outside the office, Tessa enjoys spending quality time with her 7-year-old son. Her favorite pastimes include traveling, cooking, hiking, and skiing—though she cherishes most time spent with family and friends.

Postgraduate Law Clerk

Originally born in Des Moines, Iowa, Jared would go on to discover a deep-seated passion for environmental conservation throughout high school and would later find himself in positions of leadership with Students Promoting Environmental Action in Knoxville (S.P.E.A.K) and focusing his studies on his Environmental and Soil Sciences degree at the University of Tennessee Knoxville. Prior to his legal career he worked at the Oak Ridge National Laboratory as an Environmental Technician, which would pave the way for his later work as a Co-Director of APIEL for 2024 and a faculty-level instructor for UT’s Introduction to Environmental Law undergraduate and graduate level courses.

Jared has since established himself at the Law Office of Jill M Jackson, and is continuing his public outreach and environmental research with the Denver Parks Department. During his free time, Jared is an avid runner and is currently training for a triathlon.

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(303) 818 - 7209

(303) 818 - 7209

201 Steele Street

Suite 300

Denver, CO 80206

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