About Us

We were founded by Gregory S. Simpson, CPA, in 1979. Under his guidance, we have been following principles which develop personal and professional relationships with our clients, aiding their success and protecting their finances. Our Firms principles of integrity, independence, and initiative, are based on the Christian and professional ethics of our founder. They form the basis of trust between us and our clients. Learn more about our staff below:

Gregory S. Simpson

Gregory S. Simpson

Greg is the founder and sole shareholder in Gregory S. Simpson & Assoc. P.C. He obtained his BBA degree with a major in Accounting from Texas Christian University in 1971. He gained professional experience, from 1969 to 1979, with Dahlin & Fitch, a Fort Worth Certified Public Accounting Partnership. In 1979 he founded Gregory S. Simpson & Associates.

Greg has over forty years of experience, including thirty plus years as a qualified professional, and is a member in good standing of both the Texas Society and American Institute of Certified Public Accountants. He is the first point of contact for most of our clients and is involved in all parts of our service.

Taryn Calli

Taryn Calli

Taryn has nearly 20 years of progressive experience in providing quality accounting and tax services to small and medium-sized businesses. Taryn graduated with a Bachelor of Science Degree in Accounting from the University of Wisconsin. She earned a Certified Business Accountant accreditation, a certification that has been replaced by the Accredited Business Accountant/Advisor. She has served as Controller for Medical Technology and Commercial Construction businesses. Her experience includes Sales Tax audit defense, Recovery Audit and overseeing the financial records of a wide range of businesses including property management, legal, restaurants, insurance agencies, manufacturers, health and other service industries. She has also served in multiple leadership positions for professional organizations over the years including Vice President of Finance and Vice President of Programming for the American Business Womens Association, and was a board member for the Accounting & Financial Womens Alliance (FKA ASWA) for several years. She was nominated for Top Ten Business Women for ABWA two years in a row. She joined Gregory S. Simpson and Associates in 2015 and loves making her clients and coworkers happy with her fun-loving personality.

Taryn and her family, which include four children and four grandchildren, live in North Richland Hills and enjoy traveling and family time. Their favorite vacation spots are those that include a rich history and culture.

Joy Parker

Joy Parker is the Administrative Secretary for Gregory S. Simpson & Associates, P.C. She is responsible for office management, monthly billing, and generally keeping the office running smooth. She provides expert support to all staff members. Joy Parker brings over 20 years of Office Management, Secretarial & Technology experience to the company. Whether it is on the phone or in person, you can count on a cheerful voice with a smile. Joy Parker lives with her husband, Donny and 12 year old stepdaughter, Stacey, as well as three fur babies; Gracie Lynn, Sally Brown and Charlie Brown. She also has two adult children, Stephen, age 26 and Brandon, age 24. Her relationship with Christ and Family are a very important part of her life. In her spare time, you can find her at a church event, with the family, in the garden tending to flowers or attempting the next big Pinterest craft project she has found.