Digital Intelligence Systems LLC, a McLean, Va.-based IT staffing and consulting firm, received a $20 million investment through private equity firm Weston Presidio. DISYS ranks No. 15 on Staffing Industry Analysts’ 2012 list of fastest-growing U.S. staffing firms.

“We are very proud of our momentum and growth,” DISYS founder and CEO Mahfuz Ahmed said. “The equity investment from Weston Presidio allows us to target strategic acquisitions and other growth initiatives to provide a richer portfolio of IT solutions to our growing stable of Global 1000 enterprises.”

Weston Presidio is a private equity firm that has managed five investment funds aggregating over $3.3 billion. The firm focuses its investment activities on growth companies in the consumer, business services and industrial growth sectors. It targets lower middle-market opportunities primarily in the United States.