HOWARD HUGHES MEDICAL INSTITUTE 
OFFICERS AND PRINCIPAL STAFF MEMBERS 
SEPTEMBER 1, 1991-AUGUST 31, 1992 
OFFICERS 
Purnell W. Choppin, M.D. 
President 
W. Maxwell Cowan, M.D., Ph.D. 
Vice President and Chief Scientific Officer 
Graham O. Harrison 
Vice President and Chief Investment Officer 
Joseph G. Perpich, M.D., J.D. 
Vice President for Grants and Special Programs 
Jose E. Trias, Esq. 
Vice President and General Counsel 
Robert C. White 
Vice President and Chief Financial Officer 
PRINCIPAL STAFF MEMBERS 
Craig A. Alexander, Esq. 
Associate General Counsel 
Stephen A. Barkanic 
Grants Program Officer 
W. Emmett Barkley, Ph.D. 
Director of Laboratory Safety 
Lillian H. Blucher 
Managing Director — Investments 
WinfredJ. Clingenpeel 
Director of Purchasing 
David Davis-Van Atta 
Grants Program Officer 
Barbara Filner, Ph.D. 
Grants Program Officer 
Patricia S. Gage, Esq. 
Associate General Counsel 
James R. Gavin III, M.D., Ph.D. 
Senior Scientific Officer 
Donald H. Harter, M.D. 
Senior Scientific Officer and 
Director, HHMI-NIH Research Scholars Program 
Patricia J. Hoben, Ph.D. 
Grants Program Officer 
John A. Jones 
Director of Computer Services 
David W. Kingsbury, M.D. 
Senior Scientific Officer 
Laura A. Kumin, Esq. 
Associate General Counsel 
Robert H. McGhee 
Director of Research Facilities Planning 
Alan E. Mowbray 
Director of Management Services 
Robert C. Mullins 
Director of Internal Audit 
Edward J. Palmerino 
Assistant Controller 
Robert A. Potter 
Director of Communications 
Donald C. Powell 
Director of Human Resources 
Ellen B. Safir 
Managing Director — Investments 
Dianne R. Sagner, Esq. 
Associate General Counsel 
Mark W. Smith 
Controller 
Claire H. Winestock, Ph.D. 
Senior Scientific Officer 
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