David Lobel founded Sentinel in 1995 and serves as the firm's Managing Partner. He currently is Chairman of Interim Healthcare, and a Director of Buffets and Strategic Partners. He also served as Chairman of Alemite Holdings, Castle Dental Centers, Cottman Transmission Systems, Floral Plant Growers, Growing Family, Met Merchandising Concepts, Spinrite, and Tony Roma's, and as a Director of Border Foods prior to the sale of these businesses.

Previously, Mr. Lobel spent 15 years at First Century Partners, Smith Barney's venture capital affiliate. Mr. Lobel joined First Century in 1981 and served as a general partner of funds managed by First Century from 1983 until his departure in 1995. He has been associated with several successful companies as an investor or director, including Office Depot, Entre Computer Centers, and Rocky Mountain Savings Bank. He also served as a Managing Director of Smith Barney.

Before joining First Century, Mr. Lobel was a consultant at Bain & Company from 1979 to 1981. He received an MBA and an MS with distinction from Stanford University in 1979 and 1978, respectively. Mr. Lobel, who was born in South Africa, received a B.Sc. (Hons), with highest honors, from the University of the Witwatersrand in 1975. He served with distinction in the South African Navy, where he graduated first in his class.