Freddie Mac this week hired former Chase Home Finance CEO David Lowman to head its single-family division, where he will help shape the GSE’s policies and programs that affect seller/servicers. Lowman will officially take the post May 20, the company said. Lowman is joining Freddie at a time of rapidly improving earnings. But he also must deal with several key issues facing seller/servicers, namely tight underwriting standards, changing delivery requirements and continued griping over buybacks. One current colleague of Lowman’s amusingly quipped: “I wonder what he thinks about buybacks now?”