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Sean Clayton joined Horizon in February 2022 and has nearly 20 years of experience representing public and private biotechnology companies in general corporate matters and securities laws, as well as a wide range of transactions, including public and private financings. Before joining Horizon, Sean served as a partner at Cooley LLP where he led the firm’s San Diego corporate practice. He led the Cooley team that represented Horizon in its initial public offering in 2011 and subsequently advised Horizon’s management team and board of directors on corporate and transactional matters.

Sean received his doctorate in jurisprudence from Stanford Law School and his Bachelor of Arts in political science and economics from the University of California, San Diego.