Charlie Choi is a Senior Vice President, Portfolio Manager and Head of Residential Mortgage Credit Research. The focus of his research is on credit risk–transfer securities (CRTs), legacy residential mortgage-backed securities (RMBS) and other non-agency securitizations. Choi was an instrumental part of the research team that successfully invested AB’s Public-Private Investment Program fund (sponsored by the US Treasury) during the financial crisis. In addition, his research, modeling and relative-value analysis have been integral to the success of AB’s Securitized Assets Fund since its launch in 2013. Before joining the firm in 2010, Choi worked as a mortgage analyst at Citadel Investment Group. He holds a BS in computer engineering and an MS in information systems management from Carnegie Mellon University. Location: New York