A Combination Built for the Long Term
Chasse & Company and Mangum & Associates have officially merged to form Chasse & Mangum, CPAs & Consultants, effective May 1, 2026.
After nearly two years of planning, Dan Chasse and Casey Mangum are bringing two firms together under one name — with the same focus, the same people, and an even deeper bench of expertise for the privately-held Maine businesses we serve.
Our offices in Auburn and Brunswick remain open. Nothing changes about how you access your team, your portal, or your billing.
Daniel B. Chasse
Thomas C. Mangum
Dan brings more than two decades of specialized financial and strategic advisory service experience to his clients. In his role as Chief Operating Officer for a $750 million dollar foreign owned U. S. investment trust, he gained direct operating experience that many in the accounting profession lack.
Due to his extensive private experience, he is sensitive to a wide range of issues, integrating his knowledge on short and long term operational goals for his clients. His innovative solutions are designed specifically for each independent client. This unsurpassed business expertise is critical to Chasse & Company and the clients they serve.
Casey has worked in the accounting industry for over 20 years advising clients in an array of taxation, accounting, and finance matters. Prior to joining Chasse & Mangum, Casey spent seven years working for Ernst & Young, LLP in Boston and Los Angeles. There he provided financial consulting and due diligence services on 60+ mergers/acquisitions for companies ranging in size from $1 million to over $1 billon.
Casey graduated from Wake Forest University with a Bachelor’s degree in Finance and a Master’s degree in Accountancy. He is a member of the American Institute of Certified Public Accountants and Maine Society of Certified Public Accountants.
Casey and his wife, Stephanie, live in Yarmouth with their sons John and Charlie. In his spare time Casey enjoys mountain biking, fishing, and hiking.
Focused On What Matters
Chasse & Mangum, CPAs & Consultants is a Maine-based CPA and financial advisory firm. We work primarily with privately-held, growth-oriented businesses across the state — providing tax, accounting, strategic advisory, and financial consulting services year-round.
No audits. No publicly-held companies. Just focused, proactive work for business owners who are serious about growth.
Nothing Changes For You
If you’re a current client of Chasse & Company or Mangum & Associates, here’s what you need to know:
- Your team is the same.
- Your client portal access is the same.
- Your billing process is the same.
- If you previously accessed Mangum & Associates at mangumassociates.com, you’ll be redirected automatically.
We’re Here
Have questions? Reach out to your regular contact, call us at (207) 782-6231, or get in touch with us through our website.