Emmett McGrath, president of Yoh Services, the 26th-largest US staffing firm, discusses his roots and the staffing industry in an interview with Philly.com. “For information technology, cybersecurity is becoming really big, but there’s not enough people certified in certain technologies,” McGrath told Philly.com. “In the life sciences, it’s hard to find bio-statisticians. The way you get good at it is that your recruiters aren’t jack of all trades.”