Compassionate, experienced

Meet our team

Tierney Tobin Maris

Managing Attorney

Tierney graduated from Bates College in 2009, where she earned her B.A. in Interdisciplinary Studies. She later received her M.A. in International Education Development from Columbia University Teachers College. While pursuing her masters, Tierney spent time in Thailand working with a small non-profit organization called Kwah Dao, providing educational opportunities to Burmese Shan youth.

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After completing her degree, Tierney moved back to Thailand to manage Kwah Dao’s pre-school and kindergarten program. It was during her time in Thailand that Tierney grew passionate about legal issues and migration. She eventually returned to the United States to go to law school, focusing on immigration law.

Tierney attended Colorado Law in Boulder, Colorado. She started working with Lisa Green in 2016, while still in law school. After graduating in the top ten percent of her class in 2018, she joined Lisa Green & Associates as an associate attorney.

In 2021, Tierney became the managing attorney at Green & Maris (formerly Lisa Green & Associates). In 2023, Green & Maris became Maris Immigration Law. 

Tierney joined the American Immigration Lawyers Association (AILA) in 2018 and served as the AILA Colorado Asylum Committee co-chair from 2020-2024. She served again as the co-chair from 2025-2026. Tierney's primary practice areas include asylum (both affirmative and defensive), family-based immigration, and removal defense. She has represented hundreds of clients before U.S. Citizenship and Immigration Services (USCIS), the Executive Office for Immigration Review (EOIR), and the Department of State (DOS). 

Outside of work, Tierney enjoys spending time with her family, her friends, and her pets - her three dogs (Louise, Dusty, and Maple) and her two cats (Hazel and Cricket). 

Education

University of Colorado
J.D. Law

Columbia University
M.A. International Education Development

Bates College
B.A. Interdisciplinary Studies

Activities & Affiliations

  • Member of the American Immigration Lawyers Association (AILA)
  • Co-Chair of the AILA Colorado Asylum Committee 2025-2026
  • Co-Chair of the AILA Colorado Asylum Committee 2020-2024
  • Admitted to Colorado Bar

Tierney Tobin Maris

Managing Attorney

Tierney Tobin Maris, Managing attorney at Maris Immigration Law

Katherine “Katie” Popper

Senior Attorney

Katie graduated from the University of Colorado – Boulder in 2009, where she studied international affairs and political science. While earning her undergraduate degree, she had the opportunity to study abroad in Argentina and Mexico, where she did volunteer work, honed her Spanish language skills, and developed an interest in international human rights and immigration issues. After earning her undergraduate degree, she moved back to her hometown in the suburbs of Washington, DC. Before law school, Katie worked as a paralegal at Skadden Arps and focused on the firm’s pro bono immigration cases.

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Katie graduated from American University, Washington College of Law in 2014. During law school, she worked closely with clients through the Women and the Law Clinic, where she supported survivors of domestic violence and assisted individuals seeking asylum, cancellation of removal, and T visas.

Before joining Maris Immigration, Katherine served as an associate and managing attorney at two immigration firms in Colorado. She has represented clients in a wide variety of matters from removal defense to consular processing and naturalization.

Katie is grateful for the opportunity to continue advocating for Colorado’s immigrant community as a member of the Maris Immigration team.

Education

American University Washington College of Law
J.D.

University of Colorado
B.A., International Affairs

Activities and Affiliations

Minnesota Bar, 2016
Colorado Bar, 2021
American Immigration Lawyers Association
Proficient in Spanish

Katherine “Katie” Popper

Senior Attorney

Katie Popper

Marlise (Mar) Armstrong

Attorney

After growing up in Hawaii and graduating from McGill University in Montreal, Mar Armstrong worked with a network of community centers throughout the Middle East, where her passion for helping resilient refugees find stability, security, and peace was ignited. During law school, Mar completed internships with the Harvard Immigrant and Refugee Clinic, the East Bay Community Law Center, the National Immigration Law Center, and the Post-Deportation Human Rights Project.

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Mar graduated with high honors from Northeastern University School of Law in 2016. The following year, she served as a Justice AmeriCorps Fellow at Catholic Charities, representing unaccompanied children before the Denver Immigration Court. Upon completing her fellowship, Mar opened her own practice to assist young people seeking asylum and special immigrant juvenile status.

Mar is honored to be able to continue representing incredible clients as a member of the team at Green & Maris, where she has worked since February 2019. She is proficient in Spanish.

Education

Norteastern University
J.D. Law

McGill University
B.A. Philosophy and Psychology

Activities & Affiliations

  • American Immigration Lawyers Association
  • Co-Chair of the AILA Colorado Asylum Committee 2020-2021
  • Admitted to Colorado Bar

Marlise (Mar) Armstrong

Attorney

Marlise Armstrong, Attorney at Maris Immigration Law

Alyssa Ortiz

Attorney

Alyssa received her J.D. in 2023 from the University of Colorado. During law school, she was Editor-in-Chief of the University of Colorado Law Review as well as President of the Immigration Law & Policy Society. Alyssa's passions are removal defense and the intersection of immigration and criminal law. She focused her studies on immigration and criminal law, including working as a student attorney with the Immigration & Criminal Defense Clinic and completing courses in immigration law, criminal procedure, wrongful convictions, and international human rights.

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Prior to law school, Alyssa was introduced to immigration law as an intern with the International Rescue Committee (IRC). Her work with refugees at the IRC deeply impacted and inspired her to become an advocate for immigrants. She worked as a paralegal with immigration law firms in Seattle, Washington, and Phoenix, Arizona before moving to Colorado for law school. Alyssa is now thrilled to be joining the team at Green & Maris.

Originally from Arizona, Alyssa loves the sun, summer weather, gardening, and cooking.

Alyssa Ortiz

Attorney

Alyssa Ortiz, Attorney at Maris Immigration Law

Megan Berkower

Paralegal

Megan graduated in 2011 with an Associate of Applied Science Degree in Paralegal Studies. Megan works on many different types of cases including asylum, cancellation of removal, naturalization, DACA, family-based petitions, National Visa Center and consular processing, adjustment of status, removal proceedings, employment authorization and certain types of employment-based petitions.

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Megan’s exceptional organizational skills and attention to detail are evident not only to the staff at Green & Maris, but to all our clients. Megan loves to work in the field of immigration law as it gives her an opportunity to work closely with clients on a daily basis and have a positive impact on their lives. Megan, a native of Boulder, Colorado, enjoys playing guitar, cooking and the outdoors. She has worked with Lisa Green since 2010.

Education

University of Colorado
A.A.S. Paralegal Studies

Megan Berkower

Paralegal

Megan Berkower, Senior Paralegal at Maris Immigration Law

Fernanda Ortega Canales

Paralegal

Fernanda has taken a serendipitous path from being an accomplished fashion designer in Ciudad de México to her Paralegal studies in Colorado, a place she has been proud to call home since 2008. As someone who has personally experienced the U.S. immigration process, from initial application to citizenship, Fernanda is intimately familiar with the immigration journey. She is passionate about helping people navigate the process with clarity, empathy, and kindness.

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Fernanda has enthusiastically embraced the Colorado lifestyle and has become an avid hiker, mountain biker, and distance runner. When not studying or working, she can be found training on Boulder’s numerous running paths for her favorite distance – the half marathon. Fernanda is bilingual in Spanish and English.

Education

University Autonoma de Guadalajara
B.A. Business of Fashion, Design, and Technology

Front Range Community College
Paralegal Studies - AA Degree Program (expected completion 2023)


Fernanda Ortega Canales

Paralegal

Fernanda Ortega Canales, Client Coordinator at Maris Immigration Law

Claudia Sanchez

Paralegal

Claudia began working in the field of law even before graduating from Metropolitan State University of Denver in 2021. She started as a legal assistant in a boutique firm that handled family law, and she quickly discovered her passion for helping others. Coming from a first-generation immigrant family, she felt inspired to continue her paralegal career in immigration law.

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Her family’s first-hand experience with the immigration system has ignited her passion for immigration law and fuels her unwavering commitment to assisting others on their own immigration journeys. With a heart full of empathy, Claudia dedicates herself to serving clients with compassion. Claudia is bilingual in Spanish and English.

Originally from Central Texas, Claudia loves traveling, yoga, and Colorado fall weather.

Education

Metropolitan State University of Denver
B.A Journalism, Minor in Environmental Science

Claudia Sanchez

Paralegal

Maeve O’Brien

Paralegal

Maeve graduated with a Bachelor of Arts Degree in International Relations and Sociology at Canisius University in Buffalo, New York. Following graduation, she obtained certification in Immigrant Accompaniment from Villanova University. Now specializing in asylum matters, Maeve has extensive experience in various immigration areas, including business immigration and family immigration. Maeve is passionate about Immigration Law and is dedicated to assisting individuals with their immigration needs through an empathetic perspective.

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Maeve spends most of her time outside of the office creating oil paintings. She recently travelled to Florence, Italy, to hone her skills at a Florentine art studio. When she’s not painting, Maeve can be found at her favorite yoga studio, reading, or spending time with her loved ones.

Education

Canisius University

B.A. International Relations and Sociology, Minors in Peace & Justice and Spanish Language & Culture

Villanova University

Certification in Immigrant Accompaniment

Maeve O’Brien

Paralegal

Maeve O’Brien - Paralegal at Maris Immigration Law

Sena Tilahun

Paralegal

Sena earned his Bachelor of Laws (LL.B.) degree from Addis Ababa University, Ethiopia, in 2006. He later specialized in Public International Law and completed his Master of Laws (LL.M.) at the same University in 2011. Driven by a strong passion for legal practice and education, he began his career as an Assistant Judge at the Federal First Instance Court of Ethiopia. At the same time, he worked as a part-time Lecturer of Law in both private and governmental colleges and Universities in and around Addis Ababa.

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After serving in the judiciary for more than four and a half years, Sena transitioned into private practice and has been working as an Attorney in all Federal Courts of Ethiopia since 2012. In addition to his legal practice, he has pursued an academic career, teaching law full-time – initially at the School of Law, Adama Science and Technology University (ASTU), and later at the School of Law, Arsi University.

Sena has also demonstrated a strong commitment to access to justice by providing pro-bono legal services to individuals who cannot afford a lawyer. Since the beginning of his legal career, he has supported parents with minor children through his collaboration with the Children Legal Protection Center (CLPC), a project office established and overseen by the Federal Supreme Court of Ethiopia.

Sena has worked in close collaboration with Maris Immigration Law for the past seven years, as he assisted with immigration-related cases involving Ethiopian clients. By providing legal support for adoption and other matters requiring completion in Ethiopia, he provided a valuable service to many Maris Immigration clients.

Outside of his professional work, Sena maintains an active lifestyle by playing soccer, following soccer matches, and exploring the world’s natural wonders.

Education

  • Addis Ababa University, Ethiopia
  • Bachelor of Laws (LL.B.)
  • Master of Laws (LL.M.)


Language Abilities

  • Amharic (native speaker)
  • English (fluent)
  • Oromiffa (beginner)

Sena Tilahun

Paralegal

Sena Tilahun

Sara Williams-Mann

Office Manager

Sara Williams-Mann graduated with a law degree from the University of Colorado School of Law in 1994, in the top ten percent of her class. Following graduation, she worked for Stern and Elkind, a Denver immigration law firm, specializing in asylum law and various aspects of employment-related immigration law.

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While an attorney with Stern and Elkind, Sara not only enjoyed a successful practice representing foreign nationals with immigration applications, but she worked closely with Lisa Green. As Office Manager at Green & Maris, Sara is able to combine her love for the field of immigration law with a position in management. Sara has worked with Lisa Green since 2012.

Education

University of Colorado
J.D. Law

Evergreen State College
B.A. Interdisciplinary Studies

Sara Williams-Mann

Office Manager

Sara Williams-Mann, Office Manager at Maris Immigration Law

What our clients say

“Today I have got my asylum granted letter from USCIS.”

Call Maris Immigration Law Call Maris Immigration Law Call us (303) 444-9500