Stuart is an extension of our team. He combines great customer service with a tremendous amount of knowledge and experience on transactions. - Chambers USA, 2024

Stuart Casillas is a partner in the corporate group for Kirkland & Ellis LLP's Bay Area office. Stuart is a merger and acquisition partner focusing his practice on the representation of private equity funds and their portfolio companies. Stuart acts as lead counsel in various private equity transactions, including going-private transactions, leveraged and management buyouts, growth equity investments, divestitures, restructurings and workouts, executive compensation matters, and various senior and subordinated debt financings. Stuart has negotiated and completed transactions in a wide variety of industries, including software, manufacturing, consumer products, computer hardware, post-secondary education, food service, retail, airline, financial services, oil and gas services, and logistics.

Stuart’s representative private equity clients include Vista Equity Partners, Swander Pace Capital, GI Partners, Branch Brook Holdings, Bridges Ventures, Orchard Holdings, Gryphon Investors and Industrial Growth Partners.

In 2021, Stuart was named on MergerLinks’ list of the “Top Technology Lawyers in North America.”



Chambers USA: Private Equity: Buyouts – California, 2024

Memberships & Affiliations

Board of Governors, The University Foundation, California State University, Chico

American Bar Association

California State Bar Association


Admissions & Qualifications

  • 1999California


  • The Ohio State University Moritz College of LawJ.D.1999

    University of California, Berkeley, School of Law (Boalt Hall) (Visiting Student, 1998–1999 academic year)

    Article Editor, Berkeley Technology Law Journal

  • California State University, ChicoB.A., Economics; B.S., Strategic Management1996

    Dean's List

    Member, Omicron Delta Epsilon Economics Honor Society