MannKind Corporation is a biopharmaceutical company focusing on the discovery, development, and commercialization of therapeutic products for diseases such as diabetes and pulmonary arterial hypertension. Based in Westlake Village, California, the company was founded in February 1991. However, its present form is a result of a 2003 merger of three companies owned by Alfred E. Mann, Pharmaceutical Discovery Corporation (PDC), the cancer vaccine developer CTL ImmunoTherapies, Inc., and its sister company Allecure Corp, which was developing a allergy vaccine technology. MannKind Corporation was named after its founder, Alfred Mann. One of the former companies, Pharmaceutical Discovery, was purchased in 2001 from Solomon Steiner; with that purchase MannKind acquired the Technosphere molecule and Medtone inhaler, upon which was developed its lead product, Afrezza (inhalable insulin).