Cornerstone Staffing Solutions Named to Staffing Industry Analysts’Largest Staffing Firms in the United States List Pleasanton, CA (June 30, 2016) — Cornerstone Staffing Solutions (www.cornerstone-staffing.com), is pleased to be named to the Staffing Industry Analysts (SIA) Largest Staffing Firms in the United States for the second consecutive year. The list of largest U.S. staffing firms… Read more »