Bartko Pavia Elevates Four Attorneys to Partnership

San Francisco Powerhouse Litigation Firm Promotes Cross-Practice Leaders Known for Fierce Advocacy and 360-Degree Client Service

SAN FRANCISCO (December 10, 2025) — Bartko Pavia LLP is pleased to announce the promotion of four attorneys to partnership, effective January 1, 2026. The new partner class reflects the firm's distinctive culture: a powerhouse litigation practice where high performance, collegiality, and creative problem-solving combine to deliver results for clients facing their most critical challenges.

These promotions recognize attorneys who embody what makes Bartko Pavia different -- lawyers who are fierce advocates unafraid to do battle at the highest levels, while also serving as trusted advisors and skilled client developers. Each has grown into what the firm calls a "360-degree lawyer": equally adept at litigation, strategy, and relationship-building.

"What makes this class exceptional isn't just their raw talent, though each brings fierce intelligence and creativity to everything they touch; it's their willingness to break the mold," said Firmwide Co-Managing Partner, An Nguyen Ruda. "At Bartko Pavia, we've deliberately built something different: a powerhouse litigation firm committed to representing both plaintiffs and defendants, where collegiality and high performance aren't competing values but complementary strengths. These four embody that ethos completely. They're what we call 360-degree lawyers, formidable litigators, trusted advisors, and skilled client developers who aren't afraid to take on anyone, anywhere. They've earned this because they understand that excellence requires both brilliance and courage."

Patrick M. Ryan, Litigation Department Chair and Firmwide Co-Managing Partner, added: "What excites me most about this group is watching them evolve into complete lawyers. Josiah brings the rare perspective of someone who's worked inside a legal department and his time at Children's Hospital LA taught him what clients really need. Brittany and Marisa joined us together and became a powerhouse duo: one a premier legal writer who can persuade anyone, the other a tactical mastermind who's relentlessly organized and direct. Casey left the big law treadmill, found his home here, and has racked up meaningful trial experience. They don't just win cases; they solve problems creatively, build lasting client relationships, and do battle at the highest levels without flinching. That's exactly the kind of fearless, well-rounded talent we're building this firm around."

The class includes both attorneys who have grown with the firm and strategic lateral hires who have found in Bartko Pavia a platform that values trial experience, creative thinking, and meaningful client impact over conventional metrics.

Meet the 2026 Partner Class

Brittany DeJong is a force in complex business litigation, particularly in antitrust and unfair competition matters. Known for her laser focus and unflinching directness, she excels at working hand-in-hand with teams of expert witnesses, including leading economists, and overseeing outside and internal teams handling terabytes of data, a skill that is integral to major antitrust litigation.  This requires exceptional organizational skills and strategic intelligence to representing both plaintiffs and defendants at every stage of litigation. Her background includes judicial clerkships at both state and federal levels, giving her an insider's understanding of how judges think. Whether handling intricate discovery in class actions or preparing high-stakes trials, Brittany cuts through complexity with a clear-eyed approach that clients describe as both refreshing and highly effective. She's proven herself as a working mother who balances fierce advocacy with thoughtful mentorship. She is a powerhouse who makes it look effortless.

Josiah Jenkins stands at an unusual intersection: he's equally comfortable representing employers and plaintiffs, having seen the world from both sides of labor and employment disputes. His prior experience at Children's Hospital Los Angeles gave him an invaluable perspective on what healthcare and institutional clients actually need, which is not just legal wins, but practical, implementable solutions. He represents California employers in state and federal litigation involving discrimination, harassment, retaliation, and wage-and-hour claims, bringing a common-sense approach informed by his deep understanding of how organizations actually function. Clients who worked with him speak glowingly of his judgment and accessibility. At Bartko Pavia, he's found a platform that matches his versatility, allowing him to deploy both his plaintiff-side creativity and defense-side pragmatism.

Marisa Livesay has built her reputation as one of the firm's exceptional legal writers and mentors. She focuses on complex antitrust and unfair competition litigation, bringing deep substantive expertise to multidistrict class actions, securities matters, and derivative suits for institutional investors. Her persuasive, results-driven advocacy and writing have earned praise from judges and opposing counsel alike, and her work spans state and federal courts across major litigation involving unlawful taxation, deceptive practices, and corporate accountability. As a working mother who came to Bartko Pavia alongside Brittany DeJong, Marisa exemplifies the firm's commitment to creating space for talented lawyers to excel without compromise. Her intellectual rigor and creative problem-solving have made her indispensable to clients facing bet-the-company litigation.

P. Casey Mathews made the leap from Big Law and never looked back. At Bartko Pavia, he found what he’d been searching for: a platform that values trial experience over billable hours, creativity over convention, and results over pedigree. As Firmwide Co-Managing Partner Patrick M. Ryan notes, “What differentiates our firm is that we don’t just think outside the box; we use tactics from another dimension.” It’s a philosophy that aligns perfectly with Casey’s own approach to advocacy and problem-solving. In just a few years, Casey has developed a deep well of courtroom experience, litigating complex commercial matters in both state and federal courts. His exceptional interpersonal skills paired with his warmth, charisma, and steady judgment have earned the respect of colleagues, clients, judges, and even opposing counsel. Casey’s practice spans mass torts, contract disputes, antitrust, intellectual property, and corporate governance. Across these disciplines, he brings strategic precision and a cost-effective, pragmatic approach. Clients praise his candor, clear-eyed assessments, and ability to see both the forest and the trees. For Casey, this partnership represents more than a title, it is validation that he has found the right home to build a career defined on his own terms.

About Bartko Pavia LLP

Bartko Pavia LLP is a boutique litigation powerhouse representing both plaintiffs and defendants in high-stakes commercial disputes, class actions, antitrust matters, labor and employment litigation, and bet-the-company cases. The firm is known for combining the resources and capabilities of large firms with the agility, creativity, and client focus of a boutique practice.  Bartko Pavia's culture emphasizes fierce advocacy, collaborative teamwork, and unwavering commitment to client success.

For more information, visit www.bartkopavia.com

Press Contact

Katy von Treskow | kvontreskow@bartkopavia.com | (310) 963-9037