Jonathan Lieberman has resigned as president of AG Mortgage Investment Trust Inc. and as a member of the company's board, as of Dec. 6.

Lieberman also resigned from Angelo Gordon & Co. LP, the parent of AG REIT Management LLC, AG Mortgage Investment's external manager, as of the same date.

AG Mortgage Investment's chief investment officer, Thomas Durkin, was appointed to serve as co-head of Angelo Gordon's structured credit platform. Additionally, AG Mortgage Investment's board appointed David Roberts, the company's CEO and board chairman, to the role of president.