Leadership Team

Bryan Downey


Bryan Downey was appointed as the President of the Radiopharmacies Division of Jubilant Radiopharma in May of 2020. He has more than 20 years of leadership experience in a variety of healthcare positions in large multinational companies.

Prior to joining Jubilant Radiopharma, Bryan led Alfasigma  USA as President and CEO where he successfully grew science-based innovation, new product development, brand expansion and the product portfolio. He also worked with Jubilant Pharma, in a former role, as the President of both the Cadista (interim) and the Hollistier business units. Bryan also held a series senior executive roles, transforming and leading, a variety of business units for Sanofi, Inc. Bryan was voted 2020 Global Awards Winner – Americas by CEO Today. He was awarded a MBA from Cornell University and holds a M.S and B.S. from Texas A&M University.

William Griffing

Vice President, Commercial Operations

William Griffing was appointed Vice President, Commercial Operations of the Radiopharmacies Division of Jubilant Radiopharma effective October 1, 2020. Bill has more than 30 years of leadership experience in a variety of Life Sciences and Medical Device companies.

Prior to joining Jubilant Radiopharma, Bill was Vice President, Head of Marketing and Mail Order Pharmacy Operations at Alfasigma USA where he successfully led brand and portfolio expansion and improved efficiencies in the Mail Order Pharmacy operation. He was awarded a MBA from St. John’s University (NY) and holds a B.S. in Industrial Administration from New Jersey Institute of Technology.


Brian Schumer

Vice President, Pharmacy Operations

Brian Schumer, Pharm D, is the VP of Pharmacy Operations for the company after serving as interim President of Jubilant Radiopharma. He has been with the company since 2008 and began his career as a staff pharmacist before accepting a pharmacy manager position.

Since then, he has held a variety of positions within the company, serving as part of the National Account Sales Team before being tapped as the VP-Ops for the company’s Western Region Sales and Operations.

Brian earned his Doctor of Pharmacy degree from Purdue University where his reputation as an industry leader is well known. Dr. Schumer recently authored a chapter in “Diagnostic Imaging for Pharmacists.” Published by the APhA, this book is used as the textbook in Purdue University’s Introduction to Diagnostic Imaging course, which precedes the Nuclear Program.

Brian enjoys fishing, camping and everything outdoors. He spends much of his free time having fun with his wife and three boys.

James A. Wilkinson

Vice President, Legal

Jim Wilkinson began his association with the company in 2007, serving as outside counsel until 2015 when became Senior Vice President, General Counsel and Secretary of Triad Isotopes, Inc. In that role he lead the Legal, Human Resources, Quality & Safety and Marketing functions.

At the time of the 2017 radiopharmacy acquisition he became Vice President, Legal of Jubilant Radiopharma.  Jim has over thirty years of legal experience, both as a civil trial lawyer and as general counsel.  He is admitted to practice law in the states of Colorado, Florida and New York and was awarded the highest possible rating of “AV-Preeminent” by the Martindale-Hubbell Attorney Peer Review.  Jim was also voted one of the “Top Lawyers in Orlando” by Orlando Life Magazine. He earned a Bachelor of Science in Political Science from the University of Iowa and a Juris Doctorate from Hamline University.

Wayne Alexander

Senior Director of Quality

Wayne Alexander joined Jubilant in September 2017 as Director of Quality and appointed as Senior Director of Quality, Radiopharmacies Division of Jubilant Radiopharma in September 2020. He brings with him more than 28 years of experience in the global radiopharmaceutical industry.

Prior to joining the Jubilant Radiopharma team, Wayne worked with Thermo Fisher Scientific as Senior Manager of Quality for the laboratory chemicals division. Wayne also spent 25 years at GE Healthcare as a Global Director of Quality of the molecular imaging, SPECT & PET radiopharmaceutical manufacturing and nuclear pharmacy segments, which provides a broad range of radiopharmaceuticals and services to the nuclear medicine and molecular imaging community. Wayne holds a Bachelor of Science degree and a graduate degree in business.

Don Warner

Senior Director of Pharmacy Development

Don Warner joined Jubilant Radiopharma as Senior Director of Pharmacy Development in 2017. He has over fifteen years of experience with nuclear pharmacy operations.

He was instrumental in transforming our pharmacies and cleanrooms to be compliant with the latest regulations and safety design protocols. Don leads the project teams that are expanding our footprint of new pharmacy locations nationwide.


John Little

Director of Group Purchasing Organizations / National Accounts

John Little was appointed as the Director of Group Purchasing Organizations / National Accounts of Jubilant Radiopharma in March of 2021.

He brings 30 years of Healthcare Supply Chain Operations and Group Purchasing Organization leadership and development. Prior to joining Jubilant Radiopharma, John was Executive Vice President of CoalesCo, Inc. where he successfully created and managed the Supply Chain Management (SCM) Alliance Purchasing Group Organization (GPO) successfully for 16 years acting as the Group Purchasing Organization Executive Director. The GPO was awarded top Regional Supply Chain System by the ECRI Institute. He and his team saved the SCMA Member Institutions in excess of $350 Million. Prior to CoalesCo, Inc., John worked in marketing, supply chain and procurement GPO leadership roles for Vizient (formerly VHA, Inc.), MedEcon Services and the Western New York Healthcare Association’s Shared Services Division. John also has demonstrated success in building successful supply chain and national supply contracting strategies for large Integrated Delivery Networks (IDNs) including VHA Southeast, Duke Health, Yale New Haven Health and the Mayo Clinic. John’s knowledge and expertise of GPO and IDN contracting is focused on developing sustainable and successful radiopharmaceutical contracts with both national and regional GPOs for Jubilant Radiopharma.

Elizabeth Irizarry

Director of Human Resources

Elizabeth Irizarry joined the Radiopharmacies Division in January of 2019, as the Director of Human Resources.

She has over 20 years of experience in senior human resources leadership positions. Prior to joining Jubilant, Elizabeth spent 17 years in business aviation as the most Senior HR Leader and Ethics Officer for the Americas. Elizabeth has a Bachelor’s Degree in Arts with concentration in Labor & Industrial Relations and an Associate’s Degree in Political Sciences, both from the University of Puerto Rico in San Juan, Puerto Rico, graduating Cum Laude from both. She is also a Work Life Certified Professional.

Dominic Siewko

Corporate Radiation Safety Officer and Director of Radiation Safety

Dominic Siewko joined Jubilant Radiopharma in October 2017 as the Corporate Radiation Safety Officer and Director of Radiation Safety. He has more than 20 years professional experience managing complex radiation safety programs across multiple multinational companies.

Dominic worked for GE Healthcare as a Senior Health Physicist for 10 years before becoming the Corporate Radiation Safety Officer for Philips Healthcare, a position he kept for almost 8 years before joining the Jubilant family. Dominic holds an Bachelor’s of Science degree in Nuclear Medicine from Massachusetts College of Pharmacy and a MBA from Northeastern University. He also is also a Certified Health Physicist by the American Board of Health Physics.

Shannon Julian

Chief Compliance Officer

Shannon Julian has been with Jubilant Radiopharma - Radiopharmacies Division since April of 2007. She is the Chief Compliance Officer and Chief Privacy Officer as well as the company’s Legal and Regulatory Affairs Coordinator. Prior to joining Jubilant Radiopharma.

Shannon was the Senior Corporate Paralegal of the New York Law Firm of Boies, Schiller, & Flexner for over 6 years and served with In-House Counsel to Lockheed Martin. Important aspects of her responsibilities over the years include M&A work from 2007 to the present day. She holds a B.A. in English from Macon State College as well as a degree in Paralegal Studies.

Charles Harris Jr.

Director of Information Technology

Dr. Harris, joined Jubilant Radiopharma in 2018 and currently functions as the Head of Information Technology. Charles brings with him over 21 years of information technology and strategic leadership experience; spanning applications, data, cybersecurity, and infrastructure, which are a vital part of nearly every aspect of our organization.

Charles joined Jubilant from a senior leadership role, guiding a team of software engineers for Inmarsat, a global mobile satellite communication. Charles has also held IT leadership roles across the public and private sectors, in transportation, public education, and non-profits. Charles holds a Master of Science degree in Technology from Purdue University and a PhD in Modeling & Simulation from the University of Central Florida. In addition, he is also a Certified Chief Information Security Officer

Sean Murphy

Director of Business Strategy

Sean Murphy has over 15 years of experience with nuclear pharmacy project support with Jubilant Radiopharma. He is our Director of Business Strategy, responsible for operations support, business excellence and IT business integration strategy. He leads the company in all business projects and planning initiatives.

Gagan Tuteja

Director of Finance

Gagan Tuteja joined Jubilant Radiopharma in 2014 with over ten years of rich experience in financial management leadership, including fund raising. He was part of an Ernst & Young transaction practice prior to joining Jubilant.

We use cookies to recognize your repeat visits and preferences, as well as to measure the effectiveness
of campaigns and analyze traffic. If you continue to use this site we will assume your acceptance.