Established in 1965 by the late John Callos, Callos Resource has grown from one office in Youngstown, Ohio to 21 offices scat ... tered throughout Ohio, Pennsylvania, Kansas, Kentucky and Maryland. Callos provides a broad range of human resource services to a variety of businesses which include Temporary Services, Direct Hire Services, Payroll Services, and Medical/Nursing Services. We do business with Fortune 500 companies as well as small and medium sized firms in the Manufacturing, Engineering, Retail, Medical and Warehouse industries. Our results-oriented professionals build strong partnerships with clients to ensure continuity between their corporate culture and our personnel services. Experienced, educated and certified in a variety of disciplines, Callos Resource employs a team of committed Human Resource professionals. Valuing honesty, integrity and creativity, the management and staff of Callos Resource are dedicated to providing an unparalleled quality of service to their customers and their candidates. read more