Mike Callahan, CPA Mike Callahan, CPA, is the Chief Financial Officer for MMP. He is responsible for all the financial and accounting functions at MMP, bringing 20 years of financial management experience to the company. He is a graduate of the University of Georgia with a degree in accounting and is a certified public accountant in the state of Georgia. Additionally, Mr. Callahan is a member of the American Institute of CPAs, the Georgia Society of CPAs and the Healthcare Financial Management Association. He joined MMP in 2008 and prior to that he served as the Chief Financial Officer at Reflex Security and was Vice President of Finance at Per-Se Technologies.  Mr. Callahan is based in MMP’s Atlanta, Georgia office.