Middle-market private equity firm J.F. Lehman & Co. LLC promoted Glenn Shor and David Thomas to principals.

Shor is a director of portfolio companies API Technologies Corp., Northstar Group Services Inc., NRC Group Holdings Corp. and Waste Control Specialists LLC, while Thomas is a director of portfolio companies Trident Maritime Systems LLC, Lake Shore Systems Inc., Northstar and Waste Control.

J.F. Lehman & Co., with offices in New York and Washington, targets the aerospace, defense, maritime, government and environmental industries.