Colleen Sinclair Prosser
Sinclair Prosser Gasior

900 Bestgate Road Suite 103
Annapolis, MD 21401
TEL: (410) 573-4818

Sinclair Prosser Gasior Website

About Sinclair Prosser Gasior

Sinclair Prosser Gasior is a firm focusing on estate planning, probate, trust administration and elder law issues. Based in Annapolis, MD, our mission is to provide residents of Annapolis and surrounding areas with quality estate planning resources, such as assistance with Living Trusts, Wills (simple & complex), Probate, Trust Administration, Powers of Attorney, Living Wills, Irrevocable Trusts, Family Limited Partnerships, and Charitable Giving. When you visit or call our office, we want you to feel comfortable discussing such an important issue concerning both you and your family. We want to arm you with the information you need to make an informed decision about your family's future. Visit our online Estate Planning Information Center to obtain timely, quality information on estate planning and related issues, including complimentary issues of our Special Reports and Estate Planning News articles. Residents of Annapolis and surrounding areas can register to attend our Estate Planning Seminars.

About Colleen Sinclair Prosser

Currently the owner and manager of SinclairProsser Law, LLC, Colleen steers her firm with both a guiding hand and direct involvement with the clients, bringing to the table a wealth of Estate Planning experience from many years spent at the helm of a busy law practice. Colleen is currently serving on the Board of Trustees for By Their Side, Lifelong Advocates for Marylanders with Developmental Disabilities. She formerly served on the Board of Governors of the American Academy of Estate Planning Attorneys in the past.


An established member of the American Academy of Estate Planning Attorneys, Colleen offers years of experience in estate preservation and transfer. A strong proponent of the living trust, she also focuses on wills, powers of attorney, living wills, probate, trust administration, prenuptial agreements, nursing home planning, and special needs planning. She strongly endorses long-term care insurance and, in certain cases, life insurance and some annuities as valuable estate preservation vehicles, and strives to assure the compatibility of her clients’ estate plan and financial plan. Sensitive to the challenges presented by lifestyle and circumstance, Colleen addresses each situation with personal attention, wisdom, and skill.


Colleen Sinclair Prosser received her Bachelor of Science degree with Academic Honors from University of Maryland, College Park, and earned a Juris Doctor degree from The Catholic University of America. She is an approved IRA distribution attorney under the guidance of Ed Slott—a nationally recognized IRA distribution expert—and a member of the Maryland and District of Columbia Bar. As a member of the American Academy of Estate Planning Attorneys she is required to meet 36 hours of continuing legal education per year. A strong believer that the estate plan and financial plan compliment each other; she provides ongoing continuing education classes to financial professionals to encourage a complete, comprehensive estate plan for her clients.


One of five children, Colleen was born in Washington, D.C. and is a lifetime resident of Maryland. She is the daughter of the late R. Ronald Sinclair, founder of SinclairProsser Law, LLC and executive member of the American Academy of Estate Planning Attorneys, and Maureen Mershon, partner of the Holiday Point Marina in Edgewater, Maryland. Ms. Prosser is married to award-winning artist Les Prosser, Jr. Colleen and Les are the proud parents of one son, Jake. They frequently camp in the surrounding mountain ranges and parks and especially enjoy the Adirondack Mountains of New York. Colleen also enjoys the Arts and has a fondness for British culture cultivated by her time as an exchange student in Europe.

About the American Academy of Estate Planning Attorneys

The Academy is a national organization dedicated to promoting excellence in estate planning by providing its exclusive membership of attorneys with up-to-date research on estate and tax planning, educational materials, and other important resources to empower them to provide superior estate planning services. The Academy expects members to have at least 36 hours of legal education each year specifically in estate, tax, probate and/or elder law subjects. To ensure this goal is met, the Academy provides over 40 hours of continuing legal education each year. Since 1993, the Academy has also been a highly-regarded and sought-after resource for attorneys and consumers alike, and has been recognized by Consumer Reports, Suze Orman in her book, 9 Steps to Financial Freedom and numerous times by Money Magazine.