Jon Jelinek

Advanced Clinical LLC provides staffing services. The firm also offers biometrics, clinical monitoring, ETMF and document management, feasibility, medical & safety, medical writing, patient recruitment & retention, project management, quality & validation, strategic resourcing and therapeutic expertise services. The company was founded by Leo Sheridan in 1994 and is headquartered in Deerfield, IL.

American Staffing Association offers staffing services. The firm promotes the interests of the staffing industry through lobbying, public relations, setting ethical standards and providing education. The company was founded in 1966 and is headquartered in Alexandria, VA.

Advanced Group (Scotland) Ltd. is a private company based in Lanarkshire, UK. The CEO of the British company is Leo Sheridan.

Advanced RPO LLC operates as a recruitment process outsourcing company. The firm offers recruitment and staffing services. It specializes in offshoot of traditional recruiting. The company was founded in 2007 and is headquartered in Chicago, IL.

Advanced Group, Inc. is a private company that specializes in talent acquisition and management, consulting, outsourcing, and professional services. The company was founded in 1988 and is based in Deerfield, IL. The company's businesses include Advanced Clinical, Advanced Resources, Advanced RPO, and Wunderland Group. The company provides talent opportunities, staffing and recruiting services, and outsourcing solutions for a variety of clients and industries. The company has won several awards, including Best of Staffing®, Tribune’s Top Workplaces, and Best Places to Work. Leo Sheridan has been the CEO of the company since 1988.

Advanced Personnel, Inc. provides staffing services for the healthcare, industrial, consumer, technology and financial sectors. The company was founded by Leo Sheridan in 1988 and is headquartered in Northbrook, IL.