Our Firm Quality: Doing it Right the First Time A partnership with our clients means working to find the most efficient solution to their problems. Callero & Callero combines its strengths in a diverse portfolio of services. As Callero & Callero, LLP enters its 40th year of providing accounting, tax and business services to our clients, we are excited about the changes in industry and technology that have taken place over the past few years. Our firm has always attempted to understand these changes and address our clients needs as effectively as possible. We understand the impact that technology has on businesses. Our firm has been fully automated since 1981.