Arnold Berkowitz was an investment professional and co-founder of the original hedge fund partnership associated with Michael Steinhardt. In the mid-1960s, Berkowitz partnered with Steinhardt to establish what would become a pioneering hedge fund, Steinhardt, Fine, Berkowitz & Co., launched in 1967. This venture marked an early example of the hedge fund industry, focusing on long-short equity strategies and achieving notable success in its initial years. Berkowitz's contributions to the fund's structure and operations helped lay the groundwork for Steinhardt's later prominence in finance, though specific details of his ongoing involvement post-founding are not widely documented in public sources.