About Mary E. (Betsy)
Mary E. (Betsy) Mas blends a straightforward manner with steady legal experience. She approaches client work the way her background suggests: precise, bilingual and communicative. Her resume is compact but shows a clear progression from public service to private practice.
Mas earned her Bachelor of Arts in Spanish and Communication from Aquinas College in 2007 after beginning studies in 2003. She went on to Lewis & Clark Law School, completing her J.D. in 2012 after starting in 2009. Those academic years shaped both her legal training and her comfort in cross-cultural settings.
Early in her career she spent time as a staff lawyer at the Jesse L. Williams Law & Advocacy Center in 2017. At the center she handled matters that combined legal representation and client advocacy. The role gave her day-to-day courtroom and client-contact experience. It also honed practical skills that are useful in any litigation or advisory practice.
In 2020 Mas became a partner at Mas/Stig-Nielsen, PLLC. Moving into partnership marked a shift from staff-level practice to managing client relationships and firm responsibilities. As a partner she shares decision-making on case strategy and firm operations. Colleagues describe her as methodical and clear in communication.
Her academic background in Spanish and communication shows through in her work. She is comfortable speaking Spanish in professional settings and uses that ability to explain complex legal concepts in plain terms. Her training at Lewis & Clark provided the doctrinal foundation; her practice settings provided the practical application.
Mas has navigated roles in both advocacy-centered organizations and a private firm. That range gives her a view of how different practice environments serve clients. She places value on clear written work, careful client interviews and steady courtroom preparation. Outside of direct casework she participates in firm-level planning and client intake systems.
Now a partner at Mas/Stig-Nielsen, PLLC, Mas continues to handle client matters and firm leadership responsibilities. Her current practice concentrates on providing legal services and managing client relationships at Mas/Stig-Nielsen, PLLC.
