Sean M. Larkin has joined Grossman St. Amour CPAs PLLC. He is a staff accountant in the tax department and practices in the areas of accounting, bookkeeping, income, payroll, and sales-tax return preparation. Larkin is a graduate of Niagara University, where he earned bachelor’s and master’s degrees in accounting. He participated in the Grossman St. Amour CPAs internship program