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Mr. Stack joined DoubleLine in 2015 as a Trader on the Non-Agency MBS and Whole Loans team. He was later promoted to Portfolio Manager in 2019, and is responsible for investments in Residential Mortgage-Backed Securities (RMBS), whole loans, mortgage related assets, and additionally focuses on financing and securitization activities related to performing and non-performing mortgage loan investments. Prior to DoubleLine, served as Managing Director of Research and Trading at Illumination Asset Management, LLC, where he pursued investments within an opportunistic mortgage credit strategy. Previous to Illumination, Mr. Stack was Managing Director and Treasurer at Private National Mortgage Acceptance Company, LLC (“PennyMac”), where he was responsible for financing and liquidity management across a $2.4 billion gross asset complex that included levered investments in non-performing loans, mortgage-servicing rights, and correspondent GSE loan originations. Prior to PennyMac, Mr. Stack was Senior Vice President at Countrywide Securities Corporation where he structured in excess of $70 billion of securitizations as lead structurer for the distressed residential and commercial real estate trading desks. Mr. Stack holds a BA in Economics and Political Science from Yale University.