About Jon
Jon Cieslak arrived at law after an eleven-year gap between his undergraduate degree and his JD. He earned an A.B. from Princeton University in 1999 and returned to school to receive his J.D. from UCLA School of Law in 2009. Those academic years shaped his interest in litigation and the procedural detail that often decides cases.
He is admitted to practice in California and in several federal courts. The list includes the Ninth Circuit and the U.S. District Courts for the Central, Southern, Northern and Eastern Districts of California. He also maintains an active membership in the California State Bar, a professional affiliation that anchors his courtroom work in the state’s rules and precedent.
Cieslak is a partner at Bona Law PC. At the firm he has taken on complex matters that progress through motion practice, discovery and trial. He has filed and defended cases in multiple federal venues and handled issues that require coordination across districts. Colleagues describe him as methodical in preparing pleadings and persistent in pursuing favorable outcomes for clients.
His professional record reflects a steady courtroom practice since completing his legal education. He is comfortable arguing motions and working through the procedural hurdles of federal litigation. That familiarity with district and circuit court procedures informs the way he builds cases, stages litigation and manages timelines. He also participates in firm strategy discussions about case selection and litigation plans.
Today Cieslak divides his time between court appearances, drafting litigation materials and supervising younger attorneys at his firm. He practices in federal and state courts across California and handles matters that require an attorney admitted in multiple judicial districts. His current practice concentrates on litigation in federal and state courts across California.
