Gemini is comprised of approximately 40-50 employees who embody the company culture of extreme customer service. Keep reading to learn more about our Senior Management.

Craig Rizzi

CEO / Co-Founder

With over 20 years’ experience building a career around Credentialing, Provider Relations, and Contracting, Craig has focused his expertise on the development of several major Plan credentialing programs and building of provider networks for all lines of business before starting Gemini Diversified Services, Inc. in 2006.

Tammy White

President / Co-Founder

With 30 years of service in the Credentialing industry, Tammy has a rich background of experience working for and with CVO’s, Health Plans, Medical Groups, and Hospitals. Tammy holds CPCS & CPMSM Certifications, is an active member of both NAMSS and CAMSS Associations, and has a Bachelor’s Degree in Business Management. She has been a guest speaker at several CAMSS & NAMSS conferences and remains very involved in the Credentialing community to ensure Gemini clients are kept up-to-date on regulatory requirements, health plan standards, CMS changes, and more. Tammy has facilitated over 25 NCQA and URAC surveys and always provides on-going support to our clients through NCQA, URAC, Joint Commission, DNV, AAAHC and many other surveys.

Heather Bentley

Operations Manager, Ancillary Services

Amy Pruamantong

Credentialing Manager

Matthew Cortez

Operations Manager, PSV Services
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