About Mark R De
Mark R De Yoe earned his Bachelor of Arts in Political Science from the University of Northern Colorado in 1974. That early study of government and law laid a foundation for a long career in the California legal community. He later entered legal practice and has maintained a presence in the state’s bar and professional organizations for decades.
Early in his professional life he began building ties to broader legal networks. He has held membership in the American Bar Association since 1983. A few years later he joined the San Diego County Bar Association, establishing roots in the regional legal scene in 1986. Those memberships reflect sustained engagement with both national and local professional circles.
Over the years he added memberships aligned to specific practice areas. Since 2010 he has been a member of the California DUI Lawyers Association. That association gathers attorneys who handle driving under the influence matters and related criminal issues. His participation there suggests ongoing attention to the changing law and practice surrounding impaired-driving cases.
His career spans multiple decades during which he has handled matters under California law. He has worked at a time of significant change in criminal and administrative practice, including shifts in forensic methods, court procedures, and driver's license regulations. That long horizon has allowed him to observe how statutory reform and evolving court decisions alter day-to-day advocacy.
He practices through a business bearing his name. The firm operates in California under the name Mark R. De Yoe, APLC. Through that office he represents clients across state matters, drawing on his experience in local court systems and his longstanding bar memberships. Colleagues and clients have turned to him for guidance on procedural questions and case strategy in state matters.
Outside the courtroom he has participated in professional gatherings and continuing legal education offered through the bar associations and specialized groups he belongs to. Those settings have provided ongoing exposure to case law updates, evidentiary issues, and practical approaches to client representation.
Mark R De Yoe remains active in the California legal community and continues to represent clients through his firm. He currently practices at Mark R. De Yoe, APLC, focusing on DUI defense and other matters under California law.
