Peter K. Baumgarten (1926-2000) was a chemical engineer for the DuPont Company for thirty years who continued as a consultant for the company after his retirement. He worked as a chemical engineer for DuPont and Westinghouse, retiring from the Savannah River Site in 1993. He also taught math and physics part-time at the University of South Carolina (USC)-Aiken. This small collection consists of papers, speeches, notes, presentations, and articles that Baumgarten wrote while working at DuPont as a chemical engineer and then as a consultant. His research focused on ion exchange for decontamination and waste removal from radioactive sources such as the Savanah River Plant.