Description Tilson HR (formerly Adminiserve) takes the drudgery out of administrative paperwork. A leading professional employer organization (PEO) in the Midwest US, Tilson HR handles employee payroll, insurance, retirement, and legal compliance for small and midsized businesses that don't want these functions performed in-house. The company also offers services in the areas of recruitment, background checks, and employee handbooks. Tilson HR serves clients in more than two dozen US states. The company was founded in 1995 by President and CEO Brent Tilson.