Steven Tonsfeldt represents public and private companies in domestic and cross-border M&A transactions, contested transactions, hostile takeovers and defense planning. He also advises private investors and their portfolio companies on investment and acquisition transactions, and financial advisors working with companies engaged in transactional matters.

Over the past several years, Steve has led lawyer teams in acquisition transactions having an aggregate value of well over US$100 billion.

Steve has been ranked in Corporate/M&A by Chambers USA for more than a decade. The American Lawyer has named Steve a Dealmaker of the Week. He has been recognized as a leading corporate lawyer in The Best Lawyers in America, Lawdragon, The Legal 500 and Who's Who Legal: Corporate - M&A and Governance. San Francisco Magazine has named Steve a Northern California "Super Lawyer" for many years. Steve is a past member of the Law360 M&A editorial advisory board.

Steve is a frequent speaker on corporate and M&A topics. He served on the coordinating committee for the American Bar Association's most recent Delaware Business Law Forum.

Prior to law school, Steve worked as a certified public accountant with Deloitte & Touche. He also taught accounting at UC Berkeley's Haas School of Business as a graduate student instructor.