Darren P. Keller

Cancer Treatment Centers of America, Inc. operates cancer treatment hospitals. It offers surgical oncology, chemotherapy, radiation therapy, stem cell transplantation, and photodynamic therapy treatments. The firm provides treatments for bladder, colon, kidney, lung, ovarian, pancreatic, and skin cancer. The company was founded by Richard J. Stephenson in 1988 and is headquartered in Schaumburg, IL.

Keystone Water Co. is a private company that provides spring water throughout the state of Florida. The company is based in Lake Placid, FL, and has subsidiaries in the United States. The company has 265 protected acres in Highlands County that provide some of the purest spring water in the southeast. The spring water has naturally occurring minerals such as potassium, magnesium, and calcium, making it a well-balanced and hydrating spring. The CEO of the company is Darren P. Keller.