Greentree principals collectively have over 100 years of private equity investing and hands-on business building experience. Equally important to our prospective partner companies are Greentree’s value-added private investors (“CEO Investors”), an impressive group of approximately 60 CEOs, executives, and entrepreneurs who have built successful companies in a wide range of industries. Greentree’s CEO Investors help source and evaluate prospective Greentree investments, and they provide invaluable guidance and support to Greentree’s portfolio companies as advisors and board members. In addition, Greentree is fully supported by J.H. Whitney’s accounting, financial and legal resources, as well as by the Firm’s extensive network of business contacts.

Peter Castleman
Peter has been with J.H. Whitney since 1987. Peter is Chairman and Managing Partner of J.H. Whitney.  He has been a senior investor in each of the Firm’s outside equity funds and has been the Chairman of the Investment Committee for each of the Firm’s outside private equity and mezzanine funds over the past decade. Prior to joining J.H. Whitney, he was an early member of the private equity group at Morgan Stanley & Co. Peter started his career at J.P. Morgan & Co. Incorporated. Peter is a summa cum laude and Phi Beta Kappa graduate of Duke University. He earned his M.B.A. at Harvard University Graduate School of Business, where he was a Baker Scholar.

Robert Chartener
Robert has been with J.H. Whitney since 2003. Prior to joining J.H. Whitney, he was a co-founding partner of Winslow Partners LLC. Prior to Winslow, Robert worked in the private equity and investment banking groups at Goldman, Sachs & Co., where he was a founding member of the Principal Investment Area. Robert is a graduate of Princeton University, A.B., Cambridge University, M .Phil. and Harvard University Graduate School of Business, M.B.A., where he was a Baker Scholar.

Michael Cowan
Mike has been with J.H. Whitney since 2000. Prior to joining J.H. Whitney, Mike helped build two private equity-backed companies, Emco Sales & Service and Heartland Pork Enterprises. Mike began his career at Purina Mills, Inc., the largest U.S. manufacturer and marketer of animal nutrition products, where he was rapidly promoted to the top operational finance position in the company. Mike is a graduate of LaSalle University, B.S.

Dan O’Brien
Dan has been with J.H. Whitney since 1992 and is a senior partner of the Firm. Before joining J.H. Whitney, Dan was with Coopers & Lybrand, LLP as chairman of their National Entrepreneurial Advisory Services Practice, which served SBICs and fast-growth and mid-size companies with client service teams in 120 offices throughout the United States. Dan is a graduate of Fordham University, B.S., and is a Certified Public Accountant.

Sam Shimer
Sam has been with J.H. Whitney since 2004. Prior to joining J.H. Whitney, he was a Managing Director for Counsel Corporation. Prior to Counsel, Sam worked for merchant banking funds affiliated with Lazard Frères & Co., The Blackstone Group and Drexel Burnham Lambert Incorporated. Sam is a Phi Beta Kappa, summa cum laude graduate of The Wharton School of the University of Pennsylvania, B.S. and Harvard University Graduate School of Business, M.B.A.

Michael Stone
Mike has been with J.H. Whitney since 1989.  Mike is a senior partner of J.H. Whitney, chairman of J.H. Whitney’s hedge fund investment committees, and also serves on its private equity and mezzanine debt investment committees.  Prior to joining J.H. Whitney, he was with Bain & Company.  Mike is a Phi Beta Kappa, summa cum laude graduate of Duke University, B.A. and Harvard University Graduate School of Business, M.B.A., where he graduated with honors.