Geron announces COO and CCO departures; appoints new CCO and three senior leaders

GERON CORP

COO Andrew Grethlein and CCO Jim Ziegler depart Oct 15, 2025; Grethlein stays as consultant up to 12 months.
Ahmed ElNawawi appointed EVP, Chief Commercial Officer, effective Oct 20, 2025; ex-Stemline/Novartis.
Three new SVP appointments: CTO, IR/Corporate Affairs, Portfolio/Project Mgmt; join by Oct 20.
Director Gaurav Aggarwal resigns immediately; V. Bryan Lawlis not standing for re-election at 2026 meeting.

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