Contact Marietta Marietta Courtney is a licensed C.P.A. in private practice in Franklin, MA. She has more than 20 years of experience, including roles at Arthur Andersen and other smaller, well-respected CPA firms. In 2012, she opened her own tax practice to serve the needs of local business entities, individuals and non-profits. She is a graduate of Boston College and Bentley College’s Graduate School and holds a master’s degree in taxation.