Jonathan Karen

Co-Head of Simpson Thacher's Investment Funds Practice, Jonathan has led recent efforts in industry’s most successful and market-defining private equity fund formations across multiple asset classes, including buyout, real estate and infrastructure. Notable formations include Blackstone’s most recent flagship opportunistic global real estate, corporate private equity and core private equity funds, and Silver Lake, Stonepeak Infrastructure, Rockpoint Real Estate and Centerbridge Partners in each of their flagship and ancillary funds. Jonathan also counsels investment firms on a mix of matters involving private investment funds, including internal economic arrangements for private fund sponsors, regulatory compliance, M&A transactions and strategic investments involving private fund sponsors, joint ventures and spin-outs.

Notably, Jonathan was recognized as Fund Formation “MVP” by Law360 in 2023 and 2021.

Joined Firm, 2001; Partner, 2011.