Geron Operating Chief Grethlein to Depart

Dow Jones

Oct 14, 2025

By Kelly Cloonan

Geron said Chief Operating Officer Andrew Grethlein will depart, effective Oct. 15.

Grethlein will transition to a consulting role while pursuing other interests, the biopharmaceutical company said.

Grethlein joined Geron in 2012 and has been chief operating officer since 2019.

Chief Commercial Officer Jim Ziegler will also depart, on the same date, to pursue other interests. Ziegler will be succeeded by Ahmed ElNawawi, effective Oct. 20.

The company also named three other executives to its team, including Shanthakumar Tyavanagimatt as senior vice president, chief technical officer; Dawn Schottlandt as senior vice president, investor relations and corporate affairs; and Bryan Ridgell as senior vice president, portfolio and project management and chief of staff.

The executive transitions and appointments aim to align Geron's leadership structure with its strategic priorities, the company said.

Write to Kelly Cloonan at kelly.cloonan@wsj.com

(END) Dow Jones Newswires

October 13, 2025 17:03 ET (21:03 GMT)

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Ziegler will be succeeded by Ahmed ElNawawi, effective Oct. 20.The company also named three other executives to its team, including Shanthakumar Tyavanagimatt as senior vice president, chief technical officer; Dawn Schottlandt as senior vice president, investor relations and corporate affairs; and Bryan Ridgell as senior vice president, portfolio and project management and chief of staff.The executive transitions and appointments aim to align Geron's leadership structure with its strategic priorities, the company said.","collect":0,"end_time":0,"defaultTopTitle":"","property":["rate"],"viewcount":null,"language":"en","relate_stocks":{"GERN":"杰龙"},"translate_title":"Geron运营总监Grethlein即将离职","themeId":null,"isJumpTheme":false,"ttsUrl":null,"symbols_score_info":{"GERN":1.5},"content_text":"By Kelly Cloonan \n\n\n \n\n\n  Geron said Chief Operating Officer Andrew Grethlein will depart, effective Oct. 15. \n\n\n  Grethlein will transition to a consulting role while pursuing other interests, the biopharmaceutical company said. \n\n\n  Grethlein joined Geron in 2012 and has been chief operating officer since 2019. \n\n\n  Chief Commercial Officer Jim Ziegler will also depart, on the same date, to pursue other interests. Ziegler will be succeeded by Ahmed ElNawawi, effective Oct. 20. \n\n\n  The company also named three other executives to its team, including Shanthakumar Tyavanagimatt as senior vice president, chief technical officer; Dawn Schottlandt as senior vice president, investor relations and corporate affairs; and Bryan Ridgell as senior vice president, portfolio and project management and chief of staff. \n\n\n  The executive transitions and appointments aim to align Geron's leadership structure with its strategic priorities, the company said. \n\n\n \n\n\n  Write to Kelly Cloonan at kelly.cloonan@wsj.com \n\n\n \n\n\n  (END) Dow Jones Newswires\n\n\n  October 13, 2025 17:03 ET (21:03 GMT)\n\n\n  Copyright (c) 2025 Dow Jones & Company, Inc.","kind":"highlight","is_publish_news":true,"is_publish_highlight":false,"is_publish_live":false,"is_publish_wemedia":null,"editions":null,"column":"","sentiment":"-1","news_tag":"executive","news_rank":0,"symbols":[],"gpt_button":0,"need_auth":true,"code":"91000000","status":"200"}}}