Viviani owned and operated seven restaurants in Florence, a farm house and 2 nightclubs by the time he was 27. In late 2005 he moved to Ventura County, CA, US and opened Café Firenze in Moorpark and, soon after, LA Italian restaurant Firenze Osteria in North Hollywood. Teaming up with Chicago’s Dine|Amic Group, Viviani opened a third restaurant called Siena Tavern in Chicago in February 2013. Siena Tavern was reviewed favorably by the Chicago Tribune, Thrillist, and others. He also opened Mercato by Fabio Viviani for corporate lunches at two locations in Chicago. In February 2017, Chef Viviani will be opening a restaurant called Portico at the del Lago Resort and Casino in Tyre, New York
Viviani holds several endorsement and licensing contracts with Bertolli Olive Oil, Smart Step Home Kitchen Mats, Picnic Time Giftware, and Bialetti Cookware.
Viviani runs a website, www.fabioviviani.com, with original recipes, his Kitchen Academy blog, and upcoming events. In 2014 Viviani launched a free bi-weekly E-Magazine titled Fabio’s Magazine, with recipes, wine blogs, lifestyle and health-related articles, and other content.
In late 2018 Viviani, and Oklahoma City chef Jonathon Stranger, launched Osteria OKC in Nichols Hills, an upscaled residential and shopping city within the Oklahoma City metro.