Sullivan and Associates

Sullivan and Associates PLLC was established in 1975 to serve the Tulsa business community with professional accounting and taxation services. The firm is a full-service CPA practice licensed in Oklahoma with a commitment to personal client relationships, some extending back to the early 1960s. Core services include small business accounting, bookkeeping, payroll, tax preparation and planning, audit and review services, business valuation, litigation support, bank financing consultation, succession planning, and non-profit accounting. The firm serves diverse industries including construction, dentistry, healthcare, hospitality, law firms, manufacturing, oil and gas, and real estate. Managing Partner Don B. Deselms holds CPA certification (November 1987), ABV (Accredited in Business Valuations, November 2002), and CFF (Certified in Financial Forensics, October 2008) credentials. Partner Ron Spangler holds CPA and CITP certifications with expertise in tax and technology. Partner Stephen Ridenour specializes in not-for-profit financial reporting, oil and gas taxation, and trust and estate taxation. The firm emphasizes open communication, problem-solving, and maintaining close professional relationships with clients.