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Rich Mullen
Partner
Mergers & Acquisitions
San Francisco

D415-947-2051

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  • Experienced Dealmaker

    Rich is a strategic advisor who counsels boards of directors and management teams on M&A and other transformative transactions. He has significant experience in the technology and life sciences industries, having structured and negotiated hundreds of transactions, including mergers and acquisitions, tender and exchange offers, asset acquisitions, divestitures and business carve-outs, equity investments, and joint ventures and other strategic partnerships.

  • Advisor for Companies’ Most Challenging Issues

    In addition to M&A, Rich advises boards of directors and management teams on their most challenging issues, including shareholder engagement and activism, proxy contests, unsolicited acquisition proposals and other challenges to corporate control, management succession planning, and sensitive corporate governance matters.

  • Recognized Leader

    With a strong reputation representing leading technology companies, Rich is ranked as a leading Corporate/M&A lawyer by Chambers USA and is Head of the firm's M&A practice.

Rich Mullen is a partner in the San Francisco office of Wilson Sonsini Goodrich & Rosati, where he leads the firm's M&A practice. Rich advises public and private companies, and their boards of directors and management teams, in a wide range of strategic transactions, including mergers and acquisitions, tender and exchange offers, asset acquisitions, divestitures and business carve-outs, equity investments, and joint ventures and other strategic partnerships. Rich primarily represents clients in the technology and life sciences industries, but has represented clients in various sectors, including telecommunications, healthcare, financial services, aviation, automotive, security, and manufacturing. In addition to M&A, Rich advises boards of directors and management teams on their most challenging issues, including shareholder engagement and activism, proxy contests, unsolicited acquisition proposals and other challenges to corporate control, management succession planning, and sensitive corporate governance matters.

From 2009 to 2010, Rich served as a law clerk to the Honorable Richard M. Berman of the U.S. District Court for the Southern District of New York.

Experience

Rich Mullen is a partner in the San Francisco office of Wilson Sonsini Goodrich & Rosati, where he leads the firm's M&A practice. Rich advises public and private companies, and their boards of directors and management teams, in a wide range of strategic transactions, including mergers and acquisitions, tender and exchange offers, asset acquisitions, divestitures and business carve-outs, equity investments, and joint ventures and other strategic partnerships. Rich primarily represents clients in the technology and life sciences industries, but has represented clients in various sectors, including telecommunications, healthcare, financial services, aviation, automotive, security, and manufacturing. In addition to M&A, Rich advises boards of directors and management teams on their most challenging issues, including shareholder engagement and activism, proxy contests, unsolicited acquisition proposals and other challenges to corporate control, management succession planning, and sensitive corporate governance matters.

From 2009 to 2010, Rich served as a law clerk to the Honorable Richard M. Berman of the U.S. District Court for the Southern District of New York.

Focus Areas
Recent Insights
Client Highlights
Wilson Sonsini Advises World Labs on $8.2 Billion Acquisition by AMD
On September 28, 2026, AMD, a global semiconductor company, announced it has entered into a definitive agreement to acquire World Labs, an AI model and research lab led by AI pioneer Dr. Fei-Fei Li. The acquisition will bring a world-class team of researchers and model experts to AMD, strengthening its ability to develop AI hardware, software, and systems. Wilson Sonsini Goodrich & Rosati is advising World Labs on the transaction.
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Client Highlights
Wilson Sonsini Advises Superhuman on Acquisition of Fathom
On September 14, 2026, Superhuman, an AI productivity platform bringing AI to wherever people work, announced its acquisition of Fathom, an AI meeting partner trusted by hundreds of thousands of companies to capture, search, and act on what happens in meetings. Wilson Sonsini Goodrich & Rosati advised Superhuman on the transaction.
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Recent Events
Affiliated Programs
2026 Berkeley Fall Forum on Corporate Governance
Wilson Sonsini is a proud supporter of the 11th Annual Berkeley Forum on Corporate Governance, hosted by the Berkeley Center for Law and Business. This year's event convenes judges, regulators, general counsels, and scholars for two days at the intersection of law, technology, and the markets—from controlling shareholders after SB 21 and geopolitical dealmaking to AI governance, autonomous agents, and the infrastructure race powering the next economy. Anchored by a session with three members of the Delaware Court of Chancery and conversations with leading authors and policymakers, the program treats corporate governance as what it has become: the connective tissue between technology, capital, regulation, and leadership. Sharp, current, and built for the people making the decisions.
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Affiliated Programs
Reindustrialize Summit
Wilson Sonsini is proud to sponsor Reindustrialize Summit, a premier gathering bringing together the builders, investors, policymakers, and operators driving the next era of American industrial and technological leadership.
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