Hartman has broad senior level financial experience in the aviation industry and in "Big Six" accounting. In his five years with Signature, Hartman played a leading financial role in several mergers and acquisitions. Prior to Signature, he was a Senior Manager with KPMG (Peat Marwick), overseeing aviation-related and other client accounts. Hartman has a master’s degree in accounting from Northeastern University, is a licensed CPA, and a long standing member of the AICPA.

Steve Townes, President & CEO and Founder of Ranger Aerospace, said "Jeff Hartman is a world class addition to our team of officers. He will guide our financial efforts as we continue our aggressive pursuits for continued internal growth and additional acquisitions."

Ranger is a privately held investment and management company with large financial institutions, venture capital entities, and management as shareholders. Ranger and its subsidiaries operate with 3,900 employees at 56 airports in North America and Europe. Ranger and its shareholders add value via seasoned veterans who are highly experienced in aviation services, aerospace, engineering, finance, marketing, TQM, leveraged buyouts, organizational development, post-merger integrations, and turnarounds. Ranger builds Total Quality programs and ISO-9000 initiatives, creates workforce initiatives aimed at productivity improvements, re-invests heavily in capital equipment upgrades and aggressive marketing & customer service programs, and provides aggressive leadership for its operating companies. Ranger owns Aircraft Service International Group, Inc., ASII, ASL Limited (UK), Dispatch Services, Inc., Elsinore Aviation Services, Florida Aviation Fueling Corp., Freeport Flight Services Ltd., 50% of SkyTanking GmbH (Germany), and operates LAX-FUEL (largest airport fuel consortium in the world).