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Marc Mariani began his HSI career as Chief Financial Officer in 2011 with 15 years of experience in health care finance. After earning a BA degree in both finance and accounting, he started his career as a Financial Analyst for a multi-specialty medical group in Santa Rosa, CA before joining the St. Joseph Health System of Sonoma County in 1997 as a Contract Analyst. In his 10 years with SJHS, Marc developed skills in building pricing models which were used to evaluate the performance of managed care contracts for the five hospitals of the health system in the Northern California Region. He was promoted within the health system through positions of progressively greater management responsibility, which led him to pursue a master’s degree in healthcare administration in 2005. Marc received his MHA from the University of Southern California in 2008, shortly after accepting the position of Finance Director with the Anesthesia and Analgesia Medical Group, serving Sonoma County and Napa County. Marc’s unique and in-depth experience in dealing with all aspects of the revenue cycle process from the healthcare provider’s perspective has proven to be an invaluable resource to HSI and to HSI’s clients. In July of 2016, Marc transitioned into the Chief Operating Officer role at HSI.


Joanne Alvarado joined the HSI team in 2003 with nearly two decades of collections and accounts receivable management experience. Joanne started out on the carrier side of account management with 13 years in the worker’s compensation field dealing with both private employers and large commercial contracts. She furthered her collections experience in the construction industry as a Northern California Regional Credit Manager and then with the Health Plan of the Redwoods as an Accounts Receivable Manager. In these and other positions, Joanne became versed in rules and regulations for all payer types and rapidly became an expert in the collections process. During Joanne’s tenure at HSI, she has managed the growth of what was once a 4-person billing team into a successful 60+ (and growing) revenue management cycle team. Joanne has hands-on knowledge of and has overseen all aspects of the claims management process from start to finish. She is an experienced consultant in air revenue cycle management, process improvement, and resource management. Joanne is a certified ambulance coder through the NAAC and holds several certificates and licenses in small business management and worker’s compensation management.

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