About us

BeSure Testing, Inc. is a vibrant company rooted in compassion, empowerment, and dignity.

Our team

At BeSure, our mission is ‘enlighten, enable, empower’.

All women deserve the opportunity to take charge of their own health. Our team is a dynamic collaboration of women, physicians, scientists, and clinicians.

Henry Grause


Dr. Grause is a retired Clinical Professor of Medicine from the University of California, San Francisco. He founded the first outpatient Dialysis facility in the U.S., as well as a successful nephrological critical care practice in San Francisco at the university. He is well-known in both medical circles and management entrepreneurial arenas.  

Dr. Grause was the Co-Founder and Chairman of the Board of Cistron Biotechnology, Inc. for seventeen years until it was publicly traded on NASDAQ. Citron was a clinical diagnostics company that used recombinant and monoclonal antibody technology.

Dr. Grause has been primarily involved in the management of multiple medical service businesses and in developing, owning, and managing medical real estate facilities.

Christine Hamilton


Bringing with her more than 20 years of experience, Christine Hamilton has been instrumental in the success of BeSure Testing, Inc.  Her desire to bring advanced diagnostic and affordable services to the public led her to BeSure where she has served as the Chief Operating Officer since the company’s inception, overseeing the operations and Bexa training for offices throughout the country. She was also one of the first Bexa examiners in the United States.

Christine has extensive imaging experience performing ultrasounds, biopsies, and preoperative procedures such as radioactive seed localization. She has seen firsthand how early detection is pivotal in the successful treatment of breast cancer, and her talent has helped identify numerous cases of breast cancer that has allowed patients to seek necessary treatment before spreading.

She received her degree in Diagnostic Medical Sonography in 2001 and holds multiple registries from the American Registry of Diagnostic Medical Sonographers. She is also a contributing writer for the ARDMS breast registry exam given to potential new sonographers, and has participated in FDA studies to test new breast ultrasound imaging capabilities, including opto-acoustic imaging.

Outside of the office, Christine is a wife and mother who loves spending time with her family and being involved with her children.

Eric Duermeyer


Eric is a graduate of the University of Missouri – Columbia with nearly 20 years’ experience in the financial industry. After relocating to New York City from his home in the Midwest he began his career at Citibank, where he worked for nine years, ultimately as a Vice President in the Private Banking Division.

He then moved to JP Morgan Chase’s Corporate and Investment Bank, serving there as an Anti-Money Laundering Case Lead with a focus on Latin American institutional clients. He continued his AML work at Deutsche Bank for several years, reviewing Correspondent Banking clients all over the globe.

In 2020 during the Covid Pandemic, Eric moved with his family to California, to help launch BeSure Testing. He currently resides in Sonoma with his wife and daughter.