Who We Are

We are committed to our vision of transforming lives and making hope a reality for patients with cancer.

Daniel J. O’Connor
President, Director & Chief Executive Officer

Mr. O’Connor is the Chief Executive Officer of OncoSec Medical, Inc., a biopharmaceutical company developing intratumoral cancer immunotherapies.

Most recently, he served as President and Chief Executive Officer of Advaxis Immunotherapies, Mr. O’Connor successfully turned around the company, raising more than $250 million in funding and transforming it into a patient-focused, leading cancer immunotherapy company.  He was also instrumental in establishing major partnerships with companies that include Amgen Inc., Merck & Co. and Bristol Myers Squibb. In addition, under his leadership, the company advanced four new cancer immunotherapy drug candidates into clinical trials, as well as several PD-1 combination clinical studies with Keytruda® and Opdivo®.  Previously, Mr. O’Connor was Senior Vice President for ImClone Systems where he supported the clinical development, launch, and commercialization of ERBITUX®, and the sale of the company to Eli Lilly in 2008. Mr. O’Connor served as General Counsel at PharmaNet (inventive Health) and was part of the senior leadership team that grew the company from a start-up contract research organization into a leader in clinical research.

Mr. O’Connor is a 1995 graduate of the Penn State University’s Dickinson School of Law in Carlisle, Pennsylvania and currently serves as an Entrepreneur Trusted Advisor to its Dean. He graduated from the United States Marines Corps Officer Candidate School in 1988 and was commissioned as an officer in the U.S. Marines, attaining the rank of Captain while serving in Saudi Arabia during Operation Desert Shield. Mr. O’Connor is currently the Vice Chairman of BioNJ and was a former New Jersey criminal prosecutor.

Christopher G. Twitty, PhD
Chief Scientific Officer

Dr. Twitty brings over 20 years of experience in tumor immunology and cancer immunotherapy, including the discovery and development of OncoSec’s leading clinical immune monitoring and biomarker program.

Dr. Twitty earned his PhD from Oregon Health & Science University where his work was focused on novel tumor vaccine strategies and was awarded an American Cancer Society fellowship training grant for his post-doctoral studies in Dr. Bernard Fox’s Molecular Tumor Immunology Laboratory. After developing a preclinical and clinical immunological program focused on glioblastoma at Tocagen, Dr. Twitty joined Oncosec. Previously, Dr. Twitty held scientific positions of increasing responsibility at Bayer Pharmaceuticals and Cell Genesys, Inc.

Sara Bonstein, MBA
Chief Financial Officer & Chief Operating Officer

Ms. Bonstein brings more than 15 years of operational and financial leadership in the life sciences industry with Advaxis, Inc., Eli Lilly & Company, ImClone Systems, and Johnson & Johnson.

Ms. Bonstein has extensive experience in leading biotech companies. Prior to joining OncoSec, Sara served as the Chief Financial Officer, Secretary, Treasurer and Executive Vice President at Advaxis, Inc., where she raised approximately $300 million in the capital marketplace and licensing deals. She established strong financial controls and streamlined business operations, was responsible for the overall leadership and management of its operations, including corporate finance, investor relations, business development, IT, facilities, legal and human resources. While at Eli Lilly & Company, Sara was a Six Sigma Champion and Black Belt. Prior to her Six Sigma role, Sara was the Director of Finance where she led all budget and forecast activities for preclinical, clinical and manufacturing research and development. Prior to joining ImClone, Sara was a financial analyst at Johnson & Johnson.

Ms. Bonstein earned a bachelor’s of science degree in finance with a minor in economics from The College of New Jersey and a M.B.A. from Rider University.

Sharron Gargosky, PhD
Chief Clinical Development Officer

Dr. Gargosky has over 20 years of experience in clinical development and operations in the field of pharmaceutical and biologic development having managed global programs from early research phase through the U.S. Food & Drug Administration (FDA) approval process.

Recently, Dr. Gargosky was the Chief Technical and Operations Officer at Prima Biomed, Ltd., where she led the immuno-oncology program in ovarian and pancreatic cancer globally overseeing international manufacturing, regulatory approvals, and clinical execution. Prior to Prima Biomed, Dr. Gargosky served in positions of increasing clinical and scientific responsibility at biopharmaceutical companies including Pharmacia, Medicis, and Hyperion Therapeutics. In her career, she was involved in small molecule development attaining orphan drug approvals in rare diseases. Dr. Gargosky received her Ph.D. from the University of Adelaide, Australia and completed her postdoctoral fellowship at Stanford University.