Dendreon Corp., of Seattle, promoted Grant Pickering to vice president of marketing and appointed Bogdan Dziurzynski to its board.

Discovery Therapeutics Inc., of Richmond, Va., appointed William Wheeler vice president and chief medical officer and Kenneth Rice vice president and chief commercial officer.

Diversys Ltd., of Cambridge, UK, added Ian Tomlinson as chief scientific officer.

Endovasc Ltd. Inc., of Montgomery, Texas, added Lorenz Hofmann to its clinical regulatory staff.

Esperion Therapeutics Inc., of Ann Arbor, Mich., elected Henry Blair to its board.

GeneMachines Inc., of San Carlos, Calif., appointed Terry Allread vice president of manufacturing and Patricia Gray vice president of development.

Genentech Inc., of South San Francisco, promoted Thomas Thomas to treasurer.

Genzyme Transgenics Corp., of Framingham, Mass., elected Geoffrey Cox to its board.

Geron Corp., of Menlo Park, Calif., added David Karpf as executive medical director for oncology.

Heska Corp., of Fort Collins, Colo., elected Irwin Gordon to its board.

Human Genome Sciences Inc., of Rockville, Md., appointed Richard Holbrooke and Richard Danzig to its board.