Corinne D'Ambrosio

Vice President, Sales & Marketing

Joining Mbar in 2007, Corinne now serves as Mbar's Vice-President of Sales & Marketing, as well as dedicated manufacturer's representative in Southern California ( She graduated with her Bachelor's Degree from Northeastern University and most recently earned her MBA (International Business) from CSU.  Corinne serves as Chair of the Southern California Chapter of the American Vacuum Society and is active in planning and promoting Chapter events of interest to the Vacuum Thin Film community.  Her outside interests include yoga and advocacy against Breed Discriminatory Legislation.  She is the co-founder of SoCal Pitbull TEAM, a non-profit dedicated to bully breed dogs.  She currently lives in Huntington Beach, CA with her husband and two lovable pit bulls.

Cynthia Positano


‚ÄčAs a salesperson for Vacuubrand for many years, Cynthia has a deep knowledge base about vacuum pumps and technology.  Working alongside John in Northern California, Cynthia works as a manufacturer's representative in the Bay Area and makes sure Mbar's day-to-day operations are running smoothly.  She is an organic gardening enthusiast and top notch home cook. 

John A. Freeman

CEO & President

With 40 years of experience in the field of vacuum technology, current President John Freeman founded Mbar in 2001 as the premier professional manufacturer's representative company on the West Coast.  After graduating with his degree from Northeastern University in Boston, John gained experience in the field working as a thin-film optical coating technician in his early career, then as Vice President of Sales in the United States for companies like Balzers, Pfeiffer, and VAT.  He often hosts short courses at the National Labs on topics like cryogenic pumping, vacuum gauging, and Residual Gas Analysis.  Today, he lives in Fremont, CA with his family, and enjoys vacationing in Cabo San Lucas and making electronic music in his spare time.