Brian Hirshberg is a partner in Mayer Brown’s New York office and a member of the Capital Markets practice. He focuses on representing US and foreign private issuers, sponsors, and investment banks in registered and unregistered securities offerings, including initial public offerings, follow-on offerings, private placements (including Rule 144A and PIPE transactions), at-the-market offerings, registered direct offerings, liability management transactions, preferred stock and debt offerings, and secondary offerings on behalf of issuers in a variety of industries. Brian has particular experience working on specialty finance, real estate and real estate investment trusts (REITs), business development companies (BDCs), and life sciences company deals. He also assists public company clients with ongoing securities law compliance requirements, listing standards of the major US stock exchanges, SEC public reporting obligations, shareholder-related disputes, and governance matters.

Brian is a thought leader and frequently authors articles relating to capital markets trends and topics published by Thomson Reuters’ Practical Law Company, the Practicing Law Institute, Bloomberg and LexisNexis. The Legal 500 US 2023 ranks Brian as a “Next Generation Partner” in the category of Capital Markets: Equity Offerings and recommends Brian for Capital Markets: Global Offerings, as well as for Real Estate: REITs, calling him a “key partner… specializing in equity and mortgage REITs.” The IFLR1000 2022 guide ranks Brian as a “Rising Star Partner” in the United States for Capital Markets: Equity, and he is also  a recommended lawyer by The Legal 500 US.  


The George Washington University, BA

The George Washington University Law School, JD

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  • New York