Top CPAs: Certified Accountants, Tax Preparation, Westchester County NY | White Plains. Best CPAs. Certified Public Accountants. Full Services: Tax Preparation, Audits, IRS Compliance, Bookkeeping, Experts serving Westchester County, White Plains & other towns & City in the county. Boyer''s CPAs Team. Keith Boyer, the Principal CPA has been the managing partner of Spar & Boyer, Certified Public Accountants, P.C. since 1998. Tarrytown NY. His specialties include construction contractors whom require surety bonds to obtain contracts, comprehensive financial statement preparation and analysis, tax planning, preparation, and analysis for high net-worth individuals and certified audits of contractors, not-for-profits, and closely held businesses.