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Leon O. Moulder, Jr. (age 67) is the Founder, Chief Executive Officer since August 2023, and Chairman of the Board since 2020 at Zenas BioPharma, Inc. (NASDAQ: ZBIO), a biopharmaceutical company focused on autoimmune diseases.[[1]](https://fintool.com/app/research/companies/ZBIO/people/leon-o-moulder-jr)[[4]](https://zenasbio.com/who-we-are/) He holds a Pharmacy degree from Temple University and an MBA from the University of Chicago Booth School of Business.[[1]](https://fintool.com/app/research/companies/ZBIO/people/leon-o-moulder-jr)[[6]](https://interiusbio.com/team/lonnie-moulder/) Moulder began his career as a clinical pharmacist, followed by a 17-year tenure at predecessor companies of Sanofi, including Marion Laboratories, building commercial and operational expertise.[[1]](https://fintool.com/app/research/companies/ZBIO/people/leon-o-moulder-jr)[[6]](https://interiusbio.com/team/lonnie-moulder/)
Moulder's career highlights include serving as President and CEO of MGI PHARMA (later acquired by Eisai), President, CEO, and Vice Chairman of Abraxis BioScience, and co-founding TESARO, Inc., where he led as CEO from 2010 until its $5.5 billion acquisition by GSK in 2019.[[1]](https://fintool.com/app/research/companies/ZBIO/people/leon-o-moulder-jr)[[6]](https://interiusbio.com/team/lonnie-moulder/)[[7]](https://www.chicagobooth.edu/alumni/distinguished-alumni-award/honorees/lonnie-moulder) Since March 2019, he has been Managing Member of Tellus BioVentures, LLC, with board roles at Zai Lab Ltd., Dianthus Therapeutics, and others.[[1]](https://fintool.com/app/research/companies/ZBIO/people/leon-o-moulder-jr)[[6]](https://interiusbio.com/team/lonnie-moulder/) Recently, as ZBIO CEO, he purchased $1.639 million in company stock (100,000 shares) between January 7-9, 2026, increasing his direct ownership to 366,155 shares.[[2]](https://www.investing.com/news/insider-trading-news/zenas-biopharma-zbio-ceo-moulder-buys-163m-in-stock-93CH-4440532)[[3]](https://longbridge.com/en/news/272141676)[[5]](https://www.tradingview.com/news/tradingview:a8f1e09abc733:0-zenas-biopharma-ceo-leon-o-moulder-jr-acquires-100-000-shares/)
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