Before co-founding Altus, Gregg was a Partner of Goldman Sachs and the Chief Investment Officer of the Credit Alternatives platform at Goldman Sachs Asset Management (GSAM). Prior to joining Goldman Sachs, Gregg was a senior portfolio manager at Amaranth Advisors, a multi-strategy hedge fund located in Greenwich, Connecticut. He led Amaranth’s global corporate credit investment team from 2000 to 2006.​​​​​​ ​​​​​​​Gregg has a bachelor’s degree in economics from Tufts University and a master's and J.D. from the Georgetown University Law Center and School of Business.