Executive Leadership

Tim Bertram, PhD

Dr. Bertram has served as Chief Executive Officer of ProKidney since January 2019. Since February 2017, Dr. Bertram has served on the board of directors of NexImmune, Inc. (Nasdaq: NEXI), a clinical-stage biotechnology company developing a novel approach to immunotherapy designed to orchestrate a targeted immune response by directing the function of antigen-specific T cells. … Read more

James Coulston, CPA

Mr. Coulston has served as ProKidney’s Chief Financial Officer since January 2022. Prior to that, Mr. Coulston served as ProKidney’s Senior Vice President, Finance from January 2021 to December 2021 and ProKidney’s Vice President, Finance from February 2019 to December 2020. Before joining ProKidney, from August 2015 to January 2019, Mr. Coulston served as the … Read more

Todd C. Girolamo, JD, MBA

Mr. Girolamo joined ProKidney as Chief Legal Officer in March 2022. Prior to that, he spent 11 years at Caladrius Biosciences, Inc. (Nasdaq: CLBS), where he served as Chief Legal Officer, Senior Vice President of Corporate Development and Corporate Secretary. He began his legal career at Cahill Gordon & Reindel in 1990 and later at … Read more

Deepak Jain, PhD

Dr. Jain has served as ProKidney’s Chief Operating Officer since March 2016. Dr. Jain brings over 36 years of experience in the development of tissue-engineered and cell therapy products. Previously, Dr. Jain held management roles of increasing responsibility at Johnson & Johnson (NYSE: JNJ) and Merck (NYSE: MRK) and was involved in the development of … Read more

Darin J. Weber, PhD

Dr. Weber joined ProKidney as Senior Vice President of Regulatory Development in September 2020, and was promoted to Chief Regulatory Officer, SVP and Head of Global Regulatory Affairs, Quality Management, Biometrics and Market Access. He is responsible for leading the development and implementation of ProKidney’s regulatory strategy in all markets, worldwide, interfacing with regulatory authorities … Read more

Mary Weger

Ms. Weger has an extensive and accomplished background in human resources, especially for emerging early-stage companies as well as established innovative biopharmaceutical companies. Prior to working with emerging biopharmaceutical companies, Ms. Weger spent more than ten years at Celgene Corporation as Celgene’s first Chief Human Resource Officer (CHRO) joining early in the company’s maturation with … Read more

Bruce Culleton, MD

Dr. Culleton joins ProKidney from CVS Kidney Care, a wholly owned subsidiary of CVS Health, where he was most recently Vice President and General Manager. Previously, he served as Vice President and Chief Medical Officer at CVS Kidney Care. Before joining CVS Health, he was Vice President, Global Clinical Development and World Wide Vice President, … Read more

Ashley H. Johns, MSHS

Ms. Johns has served as ProKidney’s Senior Vice President, Head of Global Clinical Operations since December 2022. Prior to that, Ms. Johns served SVP, Clinical Operations and as Vice President of Clinical Operations from March 2019, where she managed multiple cell therapy programs for ProKidney. She has extensive knowledge in the neurological and regenerative medicine … Read more

Joseph Stavas, MD, MPH

Dr. Stavas has served as ProKidney’s Senior Vice President of Clinical Development and Interventional Procedures since December 2022. He joined ProKidney as Senior Vice President of Clinical Development in October 2019 and led the strategic advancement of clinical trials and scientific discovery and development. He brings over 30 years of experience in medical practice, academics … Read more