In addition to his career as a musician, E-40 is an entrepreneur and investor who has ventured into other business and investment opportunities. He invested in Microsoft, but he said that he should have invested in Apple. ] Along with former NFL player Chester McGlockton, E-40 opened a Fatburger franchise in Pleasant Hill, California, which has now been shut down. E-40 recently authored the book, E-40's Book of Slang to be published by Warner Books. He is also a spokesperson for Landy Cognac, and he opened the now-defunct Ambassador's Lounge, a nightclub in Downtown San Jose. On Nov 16th, 2007 it was announced that Stevens signed a franchise agreement with Wingstop Restaurants, Inc. and will open one in Southampton shopping center located in Benicia, California. "I was introduced to Wingstop in Dallas and as soon as I tasted the wings I was hooked. I love the food," said Stevens. "I chose to open in the Bay Area because this is the soil where I was born and raised, and I still live here to this day. People here are going to love these things." In late 2007, E-40 announced a new line of energy drinks called "40 Water."