Perma-Fix Environmental Services, Inc. Common Stock, also called Perma-Fix Environmental Services, is a nuclear services company which provides nuclear and mixed waste management services. Read More The company operates its business through three segments: Treatment, Services and Medical. The Treatment segment includes nuclear, low-level radioactive, mixed hazardous and non-hazardous waste treatment, processing and disposal services primarily through four uniquely licensed and permitted treatment and storage facilities. The Services segment includes on-site waste management services to commercial and government customers, technical services and nuclear services. The Medical segment includes R&D costs for the new medical isotope production technology from its majority-owned Polish subsidiary, PF Medical. Perma-Fix Environmental Services was founded by Louis F. Centofanti in December 1990 and is headquartered in Atlanta, GA. The listed name for PESI is Perma-Fix Environmental Services, Inc. Common Stock.