Meet the Durango Justice Advocates Team

Practice Areas

• Criminal Defense

• Civil Protection Orders

• Guardian ad Litem (GAL) Appointments (Juvenile, Domestic, Dependency & Neglect cases)

Jurisdictions Admitted to Practice

• Colorado

• United States District Court for the District of Colorado

• Southern Ute Tribal Court

• Wisconsin

Education

• University of Wisconsin Law School—Juris Doctor, cum laude, 2002

Professional Summary

Ms. Alt brings over two decades of legal experience to Durango Justice Advocates, with a primary focus on criminal defense and civil protection order matters. She is recognized for her unwavering commitment to justice and her strategic approach in and out of the courtroom.

Following her graduation cum laude from the University of Wisconsin Law School in 2002, Ms. Alt began her legal career with the Colorado Public Defender's Office, where she served for nearly seven years. During her tenure in Pueblo and metro Denver, she handled thousands of criminal cases, from DUI to homicide. Her courtroom skill and dedication have resulted in not guilty verdicts in serious cases, including sexual assault, kidnapping, and first-degree homicide.

Beyond her litigation work, Ms. Alt has mentored and trained fellow attorneys in trial skills and legal strategy, sharing her experience to elevate the quality of criminal defense practice throughout Colorado.

In 2009, Ms. Alt relocated to Durango, CO, with her family and began a solo law practice specializing in criminal defense and family law. She also served the community as a guardian ad litem, representing the best interests of children involved in juvenile and family law proceedings.

In 2010, she joined the law firm of Greenberg and Herringer, which evolved into Greenberg, McGuinness, and Alt in 2013 and is now known as Durango Justice Advocates. Since then, Ms. Alt has continued to provide highly skilled representation across a wide spectrum of complex criminal cases.

Professional Memberships

• National Association of Criminal Defense Lawyers (NACDL)

• Colorado Criminal Defense Bar

• Colorado Bar Association

• National College for DUI Defense

• United States District of Colorado Criminal Justice Act Panel

Appointments & Honors

• Appointed in 2019 by the Governor of Colorado to serve on the 6th Judicial District Nominating Commission

Personal Interests

When she’s not in the courtroom, Ms. Alt enjoys spending quality time with her family and exploring the outdoors—especially on her mountain bike.

Practice Areas

• Family Law

• Criminal Defense

Jurisdictions Admitted to Practice

• Colorado—Admitted in 2021

• New Mexico—Admitted in 2020

• Southern Ute Tribe—Admitted in 2023

Education

• University of Colorado Law School—Juris Doctor, 2020

• New Mexico State University—Bachelor of Arts in Philosophy, Minor in Political Theory, 2016 (University Honors)

Professional Summary

Maura Guaderrama is an associate attorney at Durango Justice Advocates, focusing her practice on family law and criminal defense. She serves as both a strong advocate and thoughtful counselor to her clients, committed to guiding them through complex legal challenges with compassion and determination.

Raised near the Texas–New Mexico border, Ms. Guaderrama spent her early years between El Paso and Las Cruces. She earned her B.A. in Philosophy with a minor in Political Theory from New Mexico State University in 2016, graduating with University Honors, and later received her J.D. from the University of Colorado Law School in 2020.

Before joining Durango Justice Advocates, Ms. Guaderrama served nearly three years as a public defender, where she gained extensive trial experience representing clients in criminal matters ranging from domestic violence and assault to DUI, drug possession, and protection order violations. Her courtroom skills, strategic thinking, and client-first approach continue to benefit her family law clients—especially in high-conflict custody and financial disputes.

Maura strives to achieve amicable outcomes when possible but is always prepared to advocate zealously in court when necessary. She brings the same dedication and precision to every case, whether negotiating a parenting plan or defending against criminal charges.

Professional Memberships

• Colorado Bar Association—Member since 2023

• Southwest Colorado Bar Association—Member since 2020

• New Mexico Bar Association—Member since 2020

• Colorado Criminal Defense Bar—Member since 2023

Personal Interests

Outside of her legal work, Ms. Guaderrama enjoys coaching and competing in CrossFit, horseback riding, traveling, scuba diving, and spending quality time with her husband and their two dogs.

Practice Areas

• Criminal Defense (State & Federal)

• DUI Defense

• Violent Crimes (Murder, Manslaughter, Assault)

• Drug Offenses

• Domestic Violence

• Juvenile Defense

• Southern Ute Tribal Court Representation

Jurisdictions Admitted to Practice

• Colorado

• Southern Ute Tribal Court

Education

• University of Toledo College of Law—Juris Doctor, 1980

• University of Toledo—Master of Arts in Secondary Education/Curriculum Design, 1971

• University of Toledo—Bachelor of Education, 1968

Professional Summary

David H. Greenberg has been a criminal trial attorney in Durango, Colorado, for nearly 30 years, serving as a fierce advocate for individuals accused of criminal conduct across the state and in Southern Ute Tribal Court, where he has practiced for over 25 years.

His trial experience is vast—having defended over one hundred jury trials, including cases involving first- and second-degree murder, manslaughter, criminally negligent homicide, drug distribution, sexual assault, DUI, juvenile offenses, and domestic violence. From minor infractions to the most serious felony charges, Mr. Greenberg brings knowledge, skill, and strategic clarity to every case.

Legal Background and Career

Mr. Greenberg began his legal career as a deputy district attorney, a role he held for three years before transitioning to private practice in 1988. That early prosecutorial experience shaped his successful and long-standing career as a respected criminal defense attorney.

He is the founding partner of what is now Durango Justice Advocates, with predecessor firms including

• Greenberg, McGuinness, and Alt

• Greenberg & Herringer, LLC

• Duncan, Dickinson, Malick & Greenberg, PC

Mr. Greenberg has represented clients from all walks of life—attorneys, physicians, educators, airline pilots, musicians, laborers, and the unemployed—always with the same tireless commitment to justice, regardless of socio-economic status.

DUI Defense and Continuing Education

In recent years, David’s practice has increasingly focused on DUI defense. He is a proud member of the National College for DUI Defense and completed its intensive summer session at Harvard Law School in July 2013. His dedication to defending those accused of impaired driving has earned him recognition within the legal community and the gratitude of countless clients.

________________________________________

Professional Memberships

• National College for DUI Defense

• Colorado Criminal Defense Bar

• Colorado Bar Association

• CBA Family Law Section

Client-Centered Approach

Even after decades of practice, David remains deeply committed to his clients. He is known not only for his legal knowledge but also for his compassionate and personal approach—an ethos best expressed by the father of a former client:

“I am forever grateful for all of the caring and thoughtful work you did for our son during a very difficult time… You’re a skilled lawyer; we’re so fortunate we engaged you to help our son, but much more than that, you’re such a compassionate person... I saw you as a caring, compassionate soul taking the necessary time to help my son with his illness—it just meant so much to me.”

Personal Interests

Outside of his legal work, David enjoys bicycling and supporting his wife, Liz, his partner of over 28 years, in her passion for breeding and showing Standard Poodles.

Practice Areas

• Criminal Defense

• Family Law

• Protection Orders

• Divorce & Child Custody

Jurisdictions Admitted to Practice

• Colorado

• United States District Court for the District of Colorado

• Southern Ute Tribal Court

Education

• Northeastern University School of Law—Juris Doctor, 2020

• University of Notre Dame—Bachelor of Arts in Political Science, Minor in Poverty Studies & Policy, 2015

Professional Summary

Sean Paulsen is an associate attorney at Durango Justice Advocates, where he focuses his practice on criminal defense and family law. Known for his commitment to client advocacy and strong courtroom presence, Mr. Paulsen brings valuable experience to each case he handles.

Originally from South Bend, Indiana, Mr. Paulsen earned his B.A. from the University of Notre Dame in 2015, majoring in political science with a minor in poverty studies and policy. He went on to receive his J.D. from Northeastern University School of Law in 2020.

Before joining Durango Justice Advocates, Mr. Paulsen worked as a public defender in both the Colorado Springs and Pueblo trial offices, where he developed his skills as a zealous trial advocate. His criminal defense background includes representing clients in cases ranging from minor traffic offenses to serious felony charges.

In addition to his criminal work, Mr. Paulsen has successfully handled a broad range of family law matters, including divorce, child custody, and civil protection orders. He is committed to providing clients with both aggressive advocacy and compassionate legal support.

Personal Interests

Outside the courtroom, you’ll often find Sean exploring the outdoors. He enjoys running on the local trails around Durango and staying active in the community.

Practice Areas

• Family Law

• Wills and Trusts

• Child Custody & Support

• Civil Protection Orders

• Dependency and Neglect

• Adoption & Foster Care

• Spousal Maintenance

• Grandparent & Stepparent Rights

• Interstate Jurisdiction Issues

• Business Valuation in Divorce

• Domestic Abuse & Child Abuse Cases

Jurisdictions Admitted to Practice

• Colorado

• Southern Ute Tribal Court

 Education

• University of Michigan—Juris Doctor

• University of Michigan—Bachelor’s Degree

Professional Summary

Dan McGuinness is a seasoned family law attorney and partner at Durango Justice Advocates, where he concentrates his practice on domestic law, wills, and trusts. He brings extensive experience and strategic insight to a wide range of family-related legal matters.

Dan has successfully represented clients in cases involving

• Parental responsibilities and decision-making authority

• Child support and maintenance (alimony)

• Adoption and foster care legal processes

• Civil protection orders

• Dependency and neglect cases

• Grandparent and stepparent rights

• Interstate jurisdictional issues

• Psychological parent claims

• Complex marital estate and business asset valuation

What sets Dan apart is his meticulous preparation, deep knowledge of Colorado family law, and his ability to tailor strategies to different judicial approaches. He understands that family law matters are not just legal issues—they are deeply personal and often emotionally charged. Dan is known for his calm, results-driven approach and strong courtroom presence, always advocating for outcomes that protect his clients' futures.

H3: Philosophy and Approach

Dan was drawn to the field of domestic law because of the meaningful opportunity it provides to help individuals navigate critical life transitions. He is especially effective in high-stakes cases involving complex asset division, business valuations, and contested custody matters.

By paying close attention to the details and maintaining clear, logical communication, Dan builds strategies that clients can trust and understand.

H3: Client Feedback

A client who was represented by Dan in a high-asset divorce case shared the following:

"Thank you for your help on my case. I felt that you were very well prepared for the trial going into it, and the trial and the result confirmed my feelings. I am very happy with the results of the trial, both on the financial side and the family side. I am greatly appreciative of all of your hard work and will certainly be in touch if we have any further complications moving forward. Throughout the litigation, your communications were clear and logical. The approach that you developed to my case made a lot of sense. Thank you again."