Katharine Speer Rosenthal didn’t set out to be an immigration attorney because it was easy. She chose it because it matters.

 

Raised with the belief that justice should be personal, not procedural, Katharine has spent her career standing beside those navigating the labyrinth of U.S. immigration law—not just as a lawyer, but as a partner in the journey. Her practice is built on the idea that every person deserves a fair shot at shaping their future, and she’s honored to help make that possible.

 

Katharine earned her JD from the University of Denver Sturm College of Law in 2009, graduating with Order of St. Ives honors. She holds a BA from the University of Kansas, where she graduated summa cum laude and was inducted into Phi Beta Kappa. She is admitted to practice before the Supreme Court of Colorado (2009), the Federal District Court of Colorado (2011), and the Tenth Circuit Court of Appeals (2014).

 

Her legal work is deeply informed by her experiences living and working in Mexico, Guatemala, Honduras, and Bolivia. Fluent in Spanish, Katharine bridges cultures and communities with ease, offering bilingual legal counsel that’s as clear and empathetic as it is effective.

 

She has previously served as Chair of the Colorado Chapter of the American Immigration Lawyers Association (AILA) and currently chairs the Chapter’s DMV and Social Security Administration Committee. She also serves on the Board of the Colorado Lawyer’s Committee (CLC) and as Co-Chair of the CLC Immigration Taskforce.

 

Katharine mentors volunteer attorneys through the Rocky Mountain Immigrant Advocacy Network (RMIAN), and works with the Colorado Office of Attorney Regulation Counsel as a Practice Monitor, helping fellow attorneys refine their systems and practices. She also mentors through the Colorado Attorney Mentoring Program (CAMP), supporting lawyers early in their careers or during times of transition.

 

Katharine is a frequent speaker on immigration law and policy, and she’s not shy about sharing what she knows. She has recently spoken on the following topics:

• “Immigration Law Overview,” Metropolitan State University of Denver, April 2025

• “Immigrants’ Rights and Remedies for Unlawful Government Action,” University of Colorado, April 2025

• “Immigration Law Basics for Healthcare Providers,” Colorado Lawyers Committee, February 2025

• “Foreign Nationals & Colorado Driver Licenses,” AILA Colorado, September 2023

• “Tech Toolbox,” AILA Colorado, August 2023

• “U.S. Immigration Law & Policy,” University of Denver Sturm College of Law, April 2023

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When she’s not at the Denver USCIS Office or behind a lectern, Katharine is likely deep in conversation with a client, helping them find clarity in chaos. She doesn’t just practice law—she practices humanity.

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She lives in Boulder, Colorado, where she’s surrounded by community, creativity, and the occasional fiber arts project. If you’re ready to take the first step toward your American dream, she’s ready to walk with you.

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