simplicityHR by ALTRES is Hawaii’s largest HR and payroll provider, tracing back to Bill Guss’s 1969 founding of Labor Services Inc. in Honolulu. The Guss family’s businesses became ALTRES (ALTernative RESources for Business) in 1993, and the company established Hawaii’s first PEO in 1981; simplicityHR today offers payroll processing, HR administration, workers’ compensation, health plans, and employee benefits statewide, with additional offices on Maui and the Big Island.