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Learn More About Proton Therapy
Learn More About Proton Therapy

Leadership Team

We have a world-class team of industry veterans and seasoned executives, all of whom share a common vision of delivering on the therapeutic promise of proton therapy for patients worldwide.


  • Lawrence Yuan Tian, Ph.D.


    Lawrence Yuan Tian, Ph.D.


    Mevion has benefited from Dr. Lawrence Tian’s leadership as a member of the board of directors since 2015 and was appointed Chairman in 2018. Dr. Tian brings a wealth of experience from the life sciences and medical device industry to this role. He is a Founding Partner of YuanMing Capital, a leading private equity firm which focuses on the investment in pharmaceutical research and development, innovative medical devices and high-end medical services in both China and the United States. He also serves as the Chairman of Investment Committee of China Pharmaceutical Industry Research and Development Association, and he is a member of the Biotech Advisory Panel of the Stock Exchange of Hong Kong Limited.

    Dr. Tian also brings experience networking business leaders to the Mevion leadership team. He is the founder and Chairman of the China Entrepreneurs Forum, the most influential business owners association in China, and is the founder of the China-U.S. Business Leaders Roundtable, a prestigious cross-border communication platform.

    Prior to Mevion, Dr. Tian has had successful career as a serial entrepreneur with a strong track record of success. In the financial markets, he founded China International Futures Co., Ltd. (CIFCO) in 1992. CIFCO grew into a leading brokerage firm and achieved the largest market share in China during his chairmanship. He also co-founded Wumart Group in 1994, which is currently the largest supermarket chain in Northern China.

    Dr. Tian obtained his master’s degree and doctoral degree from Wuhan University. He received the China Economics Theory Innovation Award, China’s highest prize for economics. 

  • Tina Tianning Yu, Ph.D.

    Chief Executive Officer

    Tina Tianning Yu, Ph.D.

    Chief Executive Officer

    Mevion’s Chief Executive Officer, Dr. Tina Yu, brings more than fifteen years of professional experience working in the life sciences sector and the financing world of the healthcare industry. As a Co-Founding Partner of YuanMing Capital, a healthcare fund focusing on cross-border investment strategies, Dr. Yu led the investment in BeiGene, Ascentage Pharmaceuticals, and Mevion Medical Systems. Prior to that, Dr. Yu worked for Vision Capital, an NYC-based investment management firm, as a Director of Investment, responsible for US biotech and China sectors. Before becoming an investor, Dr. Yu was a senior research scientist at Wyeth BioPharma, where she specialized in therapeutic protein development. She also worked for Fidelity, Morgan Stanley, and Genzyme. Dr. Yu founded Matching Capital Partners to provide cross-border consulting services in the life sciences industry.

    Dr. Yu holds a Ph.D. in Chemistry from Princeton University, an MBA from Harvard Business School, and a B.S. in Biology from the University of Science and Technology of China.

  • Curt Kienast

    Chief Operating Officer

    Curt Kienast

    Chief Operating Officer

    Curt is an experienced executive who has been a part of our team since 2007. He previously worked in the defense industry and later joined the healthcare field as the president of Healthcare Technology Consulting, which focuses on quality and regulatory consulting. After participating in several mergers and acquisitions in the consulting industry, Curt joined us as our director of software quality. Through his thirteen years with us, Curt has held leadership positions in quality, engineering, and service. 
    Curt holds a Bachelor of Science in computer engineering from Embry-Riddle Aeronautical University.

  • James Meng, Ph.D.


    James Meng, Ph.D.


    James Meng brings in 22 years of healthcare industry experience to Mevion. Dr. Meng’s professional and executive experiences include the management positions with Siemens Healthineers, Philips Healthcare and GE Healthcare. In these roles, he had the responsibilities for developing emerging medical technologies, creating the luminary segment, achieving market leadership position and exceeding the sales target. Most recently, James was the Chief Marketing Officer and the President of Alltech Medical Systems, a Chinese healthcare company.

    Dr. Meng holds a Ph.D. from the Nuclear Engineering Department of Massachusetts Institute of Technology, and Harvard/MIT Radiological Science and Technology Program, an MS from Nuclear Physics of University of New Hampshire and a BS from Nuclear Physics from University of Science and Technology of China.

  • Stanley “Skip” Rosenthal, Ph.D.

    Senior Vice President, Clinical Affairs

    Stanley “Skip” Rosenthal, Ph.D.

    Senior Vice President, Clinical Affairs

    Skip’s twenty-five years of experience in radiation oncology and proton therapy date back to the Harvard Cyclotron Laboratory, where he optimized treatment planning and patient positioning for particle therapy. At Mevion, he leads our team in designing a practical clinical workflow, and is responsible for creating and overseeing Mevion’s customer education and training curriculum. Skip was previously a senior medical physicist at The Northeast Proton Therapy Center at Massachusetts General Hospital. He also held an assistant professorship at Harvard Medical School.

    Skip is board certified in therapeutic radiologic physics and holds a Ph.D. in physics from Brandeis University.

  • Ping Hu, Esq.

    Vice President, Legal and Compliance

    Ping Hu, Esq.

    Vice President, Legal and Compliance

    Ping, a seasoned attorney with extensive experience in a broad spectrum of practice areas, joined Mevion in 2019. As Mevion's General Counsel, Ping leads the legal team in the company and advises the company, its management and the Board of Directors on all legal matters on a global basis. Ping also serves as the Chief Compliance Officer and oversees the Regulatory Affairs and Quality Assurance team at Mevion.

    Before joining Mevion, Ping practiced law for over a decade in national and international law firms. Prior to his legal career, Ping worked as a software engineer in the high tech industry. He received a B.S. degree with the highest distinction from Fudan University, an M.S. degree from Dartmouth College, and a J.D. summa cum laude from Suffolk University Law School. Ping is licensed to practice law in Massachusetts, District of Massachusetts, and United States Patent and Trademark Office.

  • Mark Jones

    Vice President of Engineering

    Mark Jones

    Vice President of Engineering

    Mark Jones, Vice President of Engineering

    Mark joined Mevion in 2006, bringing a wide range of engineering expertise. Today, he serves as lead mechanical engineer of our magnet and RF accelerator systems. During his nearly 30 years in the industry, Mark led the development of many successful medical devices and earned five patents while developing MRI and CT imaging products at Analogic Corporation, cardiac imaging products at XRE Corporation, and most recently, genetic research and molecular diagnostics products at Affymetrix.

    Mark holds a Bachelor of Arts in mechanical engineering from Norwich University and a Master of Science in engineering management from the Gordon Institute of Tufts University.

  • Townsend Zwart, Ph.D.

    Vice President of Advanced Development

    Townsend Zwart, Ph.D.

    Vice President of Advanced Development

    Townsend joined Mevion in 2005 and was instrumental in the design and development of the superconducting synchrocyclotron. He holds several patents in subjects related to the synchrocyclotron and pencil beam scanning. Prior to his work at Mevion he was employed for ten years at MIT as a Research Scientist and Controls Group Leader where he contributed to the development of multiple accelerator subsystems including a 200 m 1 GeV electron storage ring, a photocathode laser driven polarized electron source and a distributed controls system.

    Townsend holds a Bachelor of Arts in Physics from Dartmouth College and a Ph.D. from Boston University in Applied Physics with a concentration on Accelerator Systems.

  • Sandra Rousselle, SPHR, SHRM-SCP

    Vice President of Human Resources

    Sandra Rousselle, SPHR, SHRM-SCP

    Vice President of Human Resources

    Sandra joined Mevion in 2018, bringing a wide range of global human resource experience. As a strategic business partner and leader, Sandra has a proven history of implementing employee engagement, development, and management programs that support the achievement of business goals and objectives while positively impacting the employee experience. Before Mevion, Sandra’s 25-year experience spans high-tech and industrial companies including Advanced Instruments LLC, Fresenius Medical Care, and Hollingsworth & Vose Company.

    Sandra is a certified Senior Professional in Human Resources (SPHR) and SHRM-SCP; and also serves as a Subject Matter Expert for the Human Resources Certification Institute (HRCI) providing periodic industry feedback and participating in SPHR exam writing campaigns.


Mr. Robert Wilson
Former Vice-Chairman, Johnson & Johnson, Inc.

Carlos A. Pérez, MD
Professor Emeritus, Radiation Oncology, Washington University School of Medicine, St. Louis, MO.