About Us

We’re here to get to know you, find personalized accounting solutions, and provide excellent customer service every step of the way.
Business Man & Woman Discussing Financial Needs

Our Firm & Core Values

Kingsport CPA, PC has been serving the Tri-Cities for all its accounting needs since 1999. Our firm is committed to providing a variety of solutions for individuals, small businesses, and not-for-profit organizations.


Our goal is to radically change your expectations of professional tax and accounting services through competent staff members, customized solutions, and outstanding personal service.

Integrity – Our commitment to honesty and transparency as we seek to build authentic, professional relationships with our staff, clients, peers, and our community as a whole.

Relevance – Our commitment to providing services based upon the needs, wants, and expectations of unique individuals.

Comprehensive — Our commitment to personal service, acknowledging that we are all unique and there is no ‘cookie cutter’ answer to what matters most to you, we will seek to customize our services in order provide comprehensive solutions.

Competence – Our commitment to the relentless pursuit of continuous improvement in our skills, knowledge, and experience and to exhibit the utmost of care in every engagement.

Value – The culmination of all the commitments above, it is the capstone and is ultimately the product we seek to deliver to every client.

Working With Kingsport CPA, PC

We provide many of the professional services you would expect from a large firm with the personal connection and attention of a small neighborhood business.


We are committed to:

Technical Competence

We only accept work for which we possess the necessary knowledge, skills, and resources so that we can provide the highest value to you. If we are not able to accept a certain engagement, we will recommend others within our professional network who may be able to provide those services.

Reasonable Pricing Structure

We work with you to set up an agreed upon fixed fee so that we can provide the ongoing accounting services and business advice you need without paying a fortune.


If a need arises that’s not within the original scope of work, we will come to a mutually agreed upon price before the service is performed. We also offer hourly rates that are very reasonable for our area and industry.

Service Guarantee

We want you to be pleased with all of our services, so our work comes with a satisfaction guarantee. If you’re not completely satisfied, please let us know immediately about your concerns. We will do everything to remedy the issue in good faith.

Meet Our Team

Each member of our team plays a crucial role in our ability to deliver professional services in a welcoming environment.

Darrell Callebs


Taher Kassaby


Theresa Short

Senior Bookkeeper

Zoe Buchanan

 Junior Accountant

Kholoud Kassaby


Tina Grubb

Senior Bookkeeper

Karen Sochon

Senior Accountant

Erika Cox

Accounting Intern

Cheyenne Branham

Administrative Manager

Let Kingsport CPA, PC serve all your tax, bookkeeping, and accounting needs.

Darrell Callebs


As principal of Kingsport CPA, PC, Darrell is committed to excellence and the highest ethical standards in providing professional services and personal attention by leading his clients and team members to success.

Darrell has over 25 years’ experience in personal, business, and entity tax and accounting, including audits of for-profit, not-for-profit, government and HUD entities. He holds a bachelor’s degree in accounting and is a Certified Public Accountant. Additionally, Darrell’s credentials include a Certified Global Management Accountant (CGMA) designation from the AICPA and a Not-for-Profit Certificate II credential from the AICPA for demonstrated proficiency in matters affecting not-for-profit organizations.

Darrell lives in Kingsport with his wife and daughter and enjoys cooking, camping and never-ending conversations about fishing. He gives back to his community using the resources and blessings received and serves as a volunteer with his church.

Taher Kassaby

Staff Accountant

Taher has earned a strong reputation among clients for being efficient, effective, and responsive. He graduated from the Academy for Science and Technology in 2006 with a degree in accounting and has experience in personal, business, and entity tax. He has passed all sections of the CPA exam and is close to becoming a licensed CPA, and is a member of several professional organizations including TSCPA and AICPA. Taher lives in Johnson City and enjoys spending time with his wife and their dog.

Theresa Short

Senior Bookkeeper

Theresa has an extensive background in office administration, bookkeeping, payroll, and tax support. She has held various positions from Bookkeeping Specialist to Office Manager. She has 13+ years working experience with QuickBooks, Peachtree, Sage Mas 90, and Microsoft Suite.

Theresa calls Tennessee home and loves friends, family, everything outdoors, travel, meeting new people and seeing new places. Her next adventure will be going back to school for self-development and the joy of learning.