About Us

Brown Chism & Thompson PLLC

Brown, Chism & Thompson is a full service CPA firm and serves clients across Northeast Oklahoma.
Our staff includes several CPAs and brings a tremendous amount of professional accounting and tax experience to benefit our clients. Our firm provides outstanding service to our clients because of our dedication to the three underlying principles of professionalism, responsiveness and quality.

Our firm is one of the leading firms in the area.  By combining our expertise, experience and the energy of our staff, each client receives close personal and professional attention. Our high standards, service and specialized staff spell the difference between our outstanding performance, and other firms.  We make sure that every client is served by the expertise of our whole firm.

Our firm is responsive.  Companies who choose us rely on competent advice and fast, accurate personnel.  We provide total financial services to individuals, large  and small businesses and other agencies. Through hard work, we have earned the respect of the business and financial communities.  This respect illustrates our diverse  talents, dedication and ability to respond quickly.

An accounting firm is known for the quality of its services.  Our firm’s reputation reflects the high standards we demand of ourselves. Our primary goal as a trusted adviser is to be available to provide insightful advice to enable our clients to make informed financial decisions.  We do not accept anything  less from ourselves and that is what we deliver to you. Our high service quality and “raving fan” clients are the result of our commitment to excellence. We will answer all of your questions, as they impact both your tax and financial situations.  We welcome you to contact us anytime.

Our Staff


Jeff Chism – CPA

Jeff began public accounting in 2002 after spending years in the banking industry. He’s the managing partner of Brown Chism & Thompson and has been a CPA since 1982.

The son of a minister, Jeff moved to the Tulsa area at age 7 and attended Berryhill High School. He earned two degrees from the University of Tulsa – BS in Accounting and an MBA.

After college, Jeff joined a local bank as a controller. From there he held chief financial officer and controller positions for companies in the banking, manufacturing and construction industries in both the public company and private sector.
Jeff works with clients to solve their, often complex, tax and accounting needs. He serves clients in several business sectors – banking, construction, real estate, manufacturing, service, and quick service restaurants.

Jeff says his unique background gives him “a broader perspective on finance in general.” He serves as Treasurer for two Broken Arrow organizations – Friends of Broken Arrow and ArtsOK.

Gretchen Thompson – CPA

Gretchen has over thirty years of experience in accounting, both public and private.  She is a CPA and specializes in small business accounting with a focus on the Bixby community and the surrounding area. She describes herself as “community oriented” and particularly enjoys working with small, family owned businesses because it allows her to form lasting relationships with clients.

Gretchen graduated from University of Tulsa with her BS in Accounting in 1983, then gained valuable experience in both private and public accounting. For seven years, she and her husband owned their own business, which helps her relate to and give guidance to clients who own their own businesses.

Gretchen has always held goals of working with the community. She describes community involvement as “her focus since I started.” She’s worked extensively with the Bixby Rotary Club since 2007, and has served as President. She’s also the former Treasurer of the Bixby Outreach Center and member of the Bixby Chamber.

Jim Gaynor – CPA

Jim started his accounting career in 1970 with Metropolitan Life Insurance Company as a traveling auditor covering the tristate area of New Jersey, New York and Connecticut.  Jim graduated from Rutgers University with a BS degree in Accounting.  He has been a CPA since 1982.

In 1979 Jim and his family moved to Broken Arrow from New Jersey.  He worked for two local CPA firms prior to starting his own firm in 1987.  He successfully grew the practice each year by surrounding himself with excellent employees, especially Mary McEhenney and Danna Segura, who still work with us.  In 2016 Jim decided it was time for him to start slowing down, so he approached Jeff and Gretchen about merging his practice with Brown, Chism & Thompson.  The merger was completed in December of 2016.

In addition to providing tax preparation, tax consulting, small business and not for profit clients, Jim specializes in audits and reviews of home owner associations, not for profit organizations and construction companies in need of bonding.

Jim served in the US Army and is a Vietnam veteran.  He is currently serving his 23rd year as a member of the finance council of the Roman Catholic Diocese of Tulsa.

Rachael Braggs – CPA

Rachael joined our team in 2015 as a Staff Accountant. She has been a CPA since 2015 and specializes in performing compilations, reviews, and audits in addition to providing tax preparation for both our individual, small business and not-for profit clients.

She graduated from Booker T. Washington High School in 2002 and graduated from Northeastern State University twice. In 2005, she earned a BA in Psychology. After taking a career assessment through Tulsa Community College, it pointed her towards a career path in accounting. She learned that accounting was her passion. In 2009, she earned a BS in Accounting while working one full time and one part time job.

After obtaining her Accounting degree, she was given additional accounting tasks at her job as an administrative assistant. In 2011, she went to work in public accounting at one of the big four firms in Tulsa as an auditor. She gained valuable experience working in a team environment auditing financial statements for SEC 500 companies, employee benefit plans, and not-for profit companies. Desiring to be closer to her family and experience working in the tax field, she found her new home with Brown Chism & Thompson.

Rachael is active in her community serving on the board for Tulsa Mother’s of Multiples and plans to serve as Treasurer in the upcoming fiscal year.

Nick Wilkerson – CPA

Nick joined our firm in 2017. He graduated with a BS in accounting from the University of Central Oklahoma in 2011 and began his public accounting career in early 2012 at a small firm in Edmond.  While working at the firm, he gained experience in financial statement compilations, tax planning and preparation for individuals and businesses, payroll preparation, and assistance in audit and attest engagements.  He earned the CPA designation in 2015 and continued to gain experience in the profession.

In 2017, he decided to move from the Oklahoma City area to the Tulsa area in order to be closer to his family who reside in Missouri.  In his spare time, Nick enjoys visiting his friends and family, sporting events, the outdoors, exercising, and cooking.




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