Jeffrey Bartlett. Mr. Bartlett is a Managing Director at HPS Investment Partners. Prior to joining HPS in 2018, Mr. Bartlett spent six years as a Managing Director at Apollo Global Management, where he was responsible for building and managing the illiquid energy credit investment strategy. Prior to that, Mr. Bartlett worked at Guggenheim Partners from 2006 to 2011, where he focused on the origination and execution of energy investments. Prior to Guggenheim Partners, Mr. Bartlett held various investment and financial roles at Amaranth, Enron Corporation and Merrill Lynch. Mr. Bartlett began his career at ARCO as a Petroleum Engineer. Mr. Bartlett holds a BS in Petroleum Engineering from the University of Kansas and an MBA from the University of Texas.