« Who We Are

Danika moved to Arizona to attend Arizona State University’s Sandra Day O’Connor College of Law, where she graduated magna cum laude. Throughout law school, Danika held externships with a variety of organizations, including a local nonprofit organization and state and local government agencies.  She also served as a Managing Editor of the Arizona State Law Journal Board of Editors, was a member of the Willem C. Vis International Moot Court Team and published two law journal articles on environmental law topics. Danika has a strong environmental sciences background, which has helped her understand and advise clients regarding environmental and hydrological issues that arise in multiparty litigation.


  • Lehigh University, B.S. (Earth & Environmental Science), 2018
  • Sandra Day O’Connor College of Law, Arizona State University, J.D., 2022
    • Graduated magna cum laude (ASU)
    • Graduated with High Honors and Departmental Honors (Lehigh University)
    • Received the Handwerk Award for Excellent Academic Performance (Lehigh University)
    • Managing Editor at Arizona State Law Journal (2020-2022)
    • Environmental Law Society Member
    • William H. Pedrick Scholar
    • CALI Excellence for the Future Award in Property (2020), Legal Advocacy (2020), Professional Responsibility (2020), Advanced Dispute Resolution (2021)


  • Arizona Supreme Court, Office of the Presiding Disciplinary Judge
  • Arizona Attorney General’s Office, Environmental Enforcement Division
  • City of Phoenix Law Department
  • The Nature Conservancy of Hawaii

Bar & Court Admissions

  • Arizona
  • Supreme Court of Arizona
  • Supreme Court of California
  • District Court for the District of Arizona
  • Ninth Circuit Court of Appeals


  • Danika Marzillier, Comment, The Great American Outdoors Act: Refreshing America’s National Parks, Ariz. State L.J., (Fall 2022)
  • Danika Marzillier & Sarah Brunswick, The New Solar Farms: Growing a Fertile Policy Environment for Agrivoltaics,24 Minn. J.L. Sci. & Tech., (Fall 2022)

Practice Areas

When you enlist the services of May Potenza Baran & Gillespie, you get an experienced, diverse team of advocates in your corner who work collaboratively, move quickly, and think differently.