Guy Ramsay Fieri is an American restaurateur, author, and an Emmy Award winning television presenter. He co-owns three restaurants in California, licenses his name to restaurants in New York City and Las Vegas, Nevada, and is known for hosting various television series on the Food Network. By mid-2010, the Food Network had made Fieri the "face of the network". In 2010, The New York Times reported that Fieri brought an "element of rowdy, mass-market culture to American food television", and that his "prime-time shows attract more male viewers than any others on the network". Fieri was born Guy Ramsay Ferry on January 22, 1968, in Columbus, Ohio, the son of Penelope Anne (née Price) and Lewis James Ferry. He grew up in Ferndale in rural Humboldt County, California. During high school, he was a foreign exchange student in France, where he developed his interest in food and cooking.

Fieri began his association with food in grade school in Ferndale, by selling pretzels from his "Awesome Pretzel" cart and washing dishes to finance his trip to France to study. On his return to the United States, he worked at the restaurant at the Red Lion Inn in Eureka, California, until he went to Las Vegas for college. Fieri attended the University of Nevada, Las Vegas, and graduated with a Bachelor of Science in Hotel Management in 1990. Soon after graduation, he went to work for Stouffer's, as manager of a Long Beach, California, restaurant called Parker's Lighthouse. After three years in southern California, he became district manager of Louise's Trattoria, managing six locations along with recruiting and training for the restaurants.

In late 1996, Fieri and business partner Steve Gruber opened Johnny Garlic's, a "California Pasta Grill" in Santa Rosa, California. A second location opened in Windsor in 1999, a third in Petaluma in 2000 or 2001 (since closed), and a fourth in Roseville in late 2008. Subsequently, they developed Tex Wasabi's (barbecue and sushi) in 2003 in Santa Rosa, adding a second location in Sacramento's Arden-Arcade area in 2007 (which was rebranded as Johnny Garlic's, and then subsequently closed). An additional Johnny Garlic's was opened in Dublin, California, in 2011. His first New York City restaurant, Guy's American Kitchen and Bar, opened in 2012 to brutal New York Times coverage by Pete Wells that Larry Olmsted of Forbes called "the most scathing review in the history of the New York Times", and "likely the most widely read restaurant review ever." Fieri, for his part, accused Wells, the nation's highest profile reviewer, of using Fieri's fame as a platform for advancing his own prestige. Despite appearing on Restaurant Business's list of the top 100 independent restaurants as ranked by sales for four years in a row, the restaurant announced plans to close at the end of 2017. In 2011, Fieri partnered with Carnival Cruise lines to create Guy's Burger Joint to sell Fieri's burgers fleet-wide. As of October 2017, there were 19 restaurants on Carnival's cruise ships, including some serving beer-and-BBQ, Guy's Pig & Anchor Smokehouse Brewhouse.

In April 2014, Guy Fieri's Vegas Kitchen and Bar opened in Las Vegas. In 2015, Guy Fieri's Baltimore Kitchen & Bar opened in Baltimore's Horseshoe Casino. In 2018, Fieri collaborated with Planet Hollywood founder Robert Earl to open fast-food chicken sandwich shop Chicken Guy! at Disney Springs in Walt Disney World.