Steve Linehan was appointed Northstar's Chief Executive Officer on February 9, 2009. Mr. Linehan's most recent experience includes founding Soporex, Inc., which consisted of a network of 70 hospital-based sleep centres; President and CEO of Radiologix, Inc., a leading U.S. national operator of 100 diagnostic imaging centres that generated (prior to its acquisition) $250 million in annual revenues; and President and CEO of Rotech Healthcare, Inc., a leading provider of home respiratory care, equipment and services, listed on NASDAQ from 2000 to 2002.

He also served as President and CEO of Blue Cross and Blue Shield of Kentucky's Alternative Health Delivery Systems business, which included a health management organization ("HMO") with hospital and physician equity partners and President and CEO of MetLife Healthcare Networks, a subsidiary of Metropolitan Life Insurance.