Pfizer, Geron Downsize to Streamline Costs on December 12, 2025 commercial strategy cost-cutting Geron Pfizer Rytelo Staff Switzerland +
Geron Corporation Announces Executive Leadership Transitions and Appointments on October 14, 2025 Ahmed ElNawawi Andrew Grethlein Appointments commercial strategy departures executive leadership Geron Corporation Harout Rytelo Semerjian +