About Peter C.
Peter C. Diamond studied philosophy at the University of Colorado–Boulder and earned his B.A. in 1984. He continued his legal education at Willamette University College of Law, receiving his J.D. in 1992. Those academic years laid a clear foundation for a career that blends legal analysis with practical problem solving.
After law school, Diamond established himself in Oregon. He is admitted to practice in the State of Oregon and before the U.S. District Court for the District of Oregon. He also appears in the Tribal Court for the Confederated Tribes of the Grand Ronde Community of Oregon, which adds a distinct dimension to the range of tribunals where he practices.
Diamond moved into partnership roles early in his career. He became a partner at Warren Allen, LLP in 1997 and later joined McKinley Irvin as a partner in 2018. In 2020 he took on a partner position at Schulte Anderson Downes Aronson & Bittner, PC. Those moves reflect steady advancement through firms that handle contested and complex matters.
His professional affiliations trace a steady involvement in bar and community legal organizations. Diamond is a fellow of the American Academy of Matrimonial Lawyers, a membership that signals engagement with family and matrimonial law peers. He has served on the Clackamas County Family Law Advisory Committee since 2018. He has also held memberships in the Clackamas County Bar Association since 2013 and the Multnomah Bar Association since 2005.
In practice, Diamond handles family and matrimonial matters, guided by courtroom experience and work in tribal settings. His AAML fellowship and committee work suggest a practice that includes contested family law proceedings and advisory roles on local family law issues. Working across state, federal and tribal forums requires attention to differing procedural rules and client needs, and his record shows sustained work in those environments.
Colleagues describe him as a steady presence in family law circles; opposing counsel have encountered him in county, federal and tribal court dockets. He continues in private practice and, as of 2026, is a partner at Schulte Anderson Downes Aronson & Bittner, PC. He currently practices family and matrimonial law at Schulte Anderson Downes Aronson & Bittner, PC.
