Willem Jan Drijfhout

PRA Health Sciences, Inc. engages in the provision of outsourced clinical development services to the biotechnology and pharmaceutical industries. It operates through Clinical Research and Data Solutions segment. The Clinical Research segment serves biopharmaceutical clients and offers outsourced clinical research and clinical trial related services. The Data Solutions segment involves in data and analytics; technology solutions and real-world insights, and services primarily to the company's life science clients. The company was founded in 1976 and is headquartered in Raleigh, NC.

Pharma Bio-Research Group BV specialized in research in the pharmaceutical and biotech sector. It offered services for phase I/IIA clinical research, bioanalysis and biometrics. Founded in 1981, the company was headquartered in Zuidlaren, the Netherlands