Matthew L. Scarber is a Tucson native. He started his career with Rubin & Bernstein PLLC focusing on probate and estate planning until he opened his own probate and estate planning firm in 2023. He attended the University of Arizona and graduated Magna Cum Laude in 2014 with a Major in Political Science and Minor in Africana Studies. In 2017 he graduated from the University of Kansas School of Law to earn his JD.
Matthew is commitment to both public service and diversity. In Kansas he was recognized for his service with the Walter Hiersteiner Outstanding Service Award, presented to the graduating law student that has shown a significant commitment to the community they serve. He was also recognized as a finalist for The University of Kansas's 2017 Diversity Leadership Award.
Greta Maria Vietor is a native Iowan who has lived in Tucson, Arizona since 2002. She attended the University of Iowa, where she earned a bachelor's degree in political science in 1997 and a J.D. in 2000. After her second year of law school, she interned at the Midwest Center for Justice in Chicago, Illinois doing research on death penalty appeals. After law school, she served as a law clerk for the Honorable Donald E. O'Brien in the Northern District of Iowa from 2000 to 2002. In 2002, she became an Assistant Federal Public Defender in Tucson, Arizona where she continues to work representing indigent people. She has been an active member of AMBA since 2017 and she currently serves as AMBA's Communications Director.
Leticia Marquez, is a supervisor attorney of the Federal Public Defender's Office and has recently become head of the Tucson office. She has been with the office since 1999 and since 2007 has supervised the Capital Habeas Unit (Tucson and Phoenix) while maintaining a capital caseload. She provides training locally and nationally on capital issues. Although she now specializes in capital habeas corpus, Leticia has experience in capital cases at all levels of appeal.
Ms. Marquez has specialized on mental health issues, including intellectual disability cases and competency to assist matters. She argued Ryan v. Gonzales, a case dealing with competency to assist counsel, in the United States Supreme Court in October 2012. She was only the sixteenth Latina to argue before the Court.
Ms. Marquez has served as president of AMBA and is currently the organization's treasurer. She is a 1995 graduate of the University of Arizona College of Law and served on the Indigent Defense Task Force of the State Bar and Committee on the Rules of Professional Conduct (Ethics) of the State Bar. Over the years Ms. Marquez's work has been recognized through various awards, including the second ever PCBA Robert J. Hooker Criminal Justice Award and the prestigious AJC Learned Hand Community Service Award.
Harris Abraham Rubin (no picture available) is the Secretary for AMBA. Mr. Rubin currently serves as a deputy prosecutor for the Pima County Prosecutor's Office and has been active with AMBA since law school. Mr. Rubin is a graduate of the University of Arizona, James E. Rogers College of Law.
Annamarie Valdivia has served as president (2017-2021), vice-president (2016-2017) and communications director over the past 15 years. Ms. Valdivia is currently serving as the Communication Director where is responsible for updating the AMBA website and listserv to ensure that members have access to announcements like upcoming events and employment opportunities. Ms. Valdivia has been a criminal defense attorney for nearly 18 years and is currently in private practice at Mulembo Law, PLLC, a small law firm focusing on family law and criminal defense. Ms. Valdivia is licensed to practice in Arizona's state and federal courts, the Pascua Yaqui Nation, and the Ninth Circuit Court of Appeals. Ms. Valdivia been an active member of AMBA since 2011 and has also served on Board of Directors for Los Abogados Hispanic Bar Association, the State Bar of Arizona, Committee on Minorities, and Women in the Law. She is also a graduate of the State Bar of Arizona's Bar Leadership Institute.
Krystal De La Ossa is a Deputy County Attorney in the Civil Division of the Pima County Attorney's Office, where she litigates tax and land use cases. Previously, she was a judicial law clerk for the Honorable D. Douglas Metcalf at Pima County Superior Court.
She earned her law degree from the University of Arizona James E. Rogers College of Law in 2021. While in law school, she was the Senior Note Editor for the Arizona Journal of International & Comparative Law. She was also a law clerk for the Pima County Public Defender's Office, a legal intern for DeConcini McDonald Yetwin & Lacy. P.C, and a judicial extern for the Honorable Maria S. Aguilera at United States District Court for the District of Arizona.
Krystal received a Bachelor of Arts and a Bachelor of Science, summa cum laude, in Psychology and Criminal Justice from the University of Arizona in 2017.
Krystal participated in AMBA's Writing Program as a law school student, and she hopes to give back to the community as the Member-At-Large by continuing to support AMBA's mission of promoting diversity.