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Meet Our Team

Thomas C. Mangum, CPA


Thomas C. Mangum “Casey” became the principal of our firm in 2015. An experienced CPA, Casey has worked in the accounting industry for over 10 years advising clients in an array of taxation, accounting, and finance matters. Prior to acquiring Mangum & Associates, Casey spent seven years working for Ernst & Young, LLP in Boston and Los Angeles. While there he provided in depth financial due diligence on over 60 mergers/acquisitions 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. In the local community, Casey serves on the finance committee of Oasis Free Clinics.

Casey and his wife, Stephanie, live in Portland with their son John. In his spare time Casey enjoys mountain biking, fishing, and hiking.

William H. Mangum


Bill Mangum founded our firm in 1971. With over 40 years of experience in personal and business tax preparation, financial planning, payroll, accounting, and retirement planning, Bill offers our clients a wealth of advice and expertise.  

Prior to founding Mangum & Associates, Bill was a pilot in the United States Navy. He graduated from Wake Forest University with a degree in Mathematics.  He is a board member of the Holbrook Community Foundation.

Bill and his wife, Paige, live in Harpswell. They have two sons, Gordon and Casey. Bill enjoys fishing, hunting, and boating in his spare time.

Echo Palmer

Staff Accountant

Echo  joined our firm in 2015. Her responsibilities include bookkeeping, QuickBooks consulting, individual and corporation tax preparation, and payroll processing. She specializes in QuickBooks set-up, maintenance, and consultation. Prior to joining our firm she worked at Jay Goldstein, CPA in Brookline, MA.

Echo is a mother of three children. Outside of the office, Echo enjoys yoga, hiking, music, and gardening.

Hilary Innis

Staff Accountant

Hilary has over 25 years of experience in office administration, bookkeeping and payroll processing.  Her work history spans many business sectors including professional services, property management, energy development, non-profits, and political organizations.  She splits her time between Mangum & Associates and another administrative office here in Brunswick. Hilary has over a decade of experience working in QuickBooks. She provides bookkeeping and payroll services for a number of our clients.

She enjoys her personal time gardening, hiking, kayaking, skiing, and spending time with her family at their camps on the ocean and lakes.

Linda LeClair

Office Manager

Linda has worked at Mangum & Associates since 2001. Her responsibilities include being the first point of contact for all clients, providing payroll and bill paying services to businesses and individuals, and management of the firm’s receivables, payables, and other operational functions.

Linda has always been in customer service. She worked for Mere Point OB/GYN for 12 years as a receptionist and scheduler. When her two boys were young she was a waitress at the Dolphin Marina in Harpswell, Maine.

Linda grew up in the area and attended Mt. Ararat High School in Topsham, Maine and the University of Maine Farmington. It was in college that she met her husband Gary. They have been married for 37 years. They have four grandchildren together, and every Saturday they come to “Memere’s” house!

Her interests include walking, singing in a band at church, biking, traveling, cooking, gardening, kayaking, golf and cross country skiing.

Latest from Our Blog

Our New Website!

Mangum & Associates is excited to announce the recent launch of our firm’s new website. We’ve been working very hard to enhance our website and give our firm a fresh look. We’ve also continued to research and identify the latest and greatest technologies to improve the services we provide and ensure we continue to meet your needs.

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