About David J.
David J. Collier’s professional life brings numbers and narrative together. He studied two disciplines that prize different kinds of reasoning. He earned a B.A. in mathematics and history from the University of California, Berkeley in 1989. He later completed an M.A. in mathematics at the University of California, Santa Barbara in 1993. Those academic years left him comfortable with complex data and long, careful lines of argument.
He entered the legal field after his graduate work and over time moved into private practice. In 2010 he became the principal lawyer of David J. Collier, Lawyer at Law. The title reflects his role leading the practice and managing client matters. His colleagues and clients see a lawyer who approaches problems methodically. He breaks issues into component parts and examines the evidence step by step.
Collier’s training in mathematics and history shapes how he prepares cases. He favors thorough document review and organizes facts in formats that make patterns easier to spot. He also draws on historical perspective when tracing events and motivations over time. That combination affects both written work and courtroom presentations. He aims to present arguments that rest on documented sequences rather than on rhetorical flourishes.
Outside the office he maintains memberships in professional associations. He participates in continuing legal education and in association activities that keep him current on changes in California law. Those memberships provide a connection to peers and periodically influence how he handles procedural developments and emerging practice issues.
Clients work with Collier for direct access to the lawyer running the matter. He oversees case strategy and handles substantive legal tasks himself rather than delegating all work to junior staff. He emphasizes clarity in records and careful pacing in litigation and transactional work. That approach suits disputes or projects where the underlying facts require close study.
As of 2026 Collier practices in California as the principal of David J. Collier, Lawyer at Law and applies his analytical and historical training to legal matters that benefit from disciplined review and structured argumentation.
