Long before he became known for his charming personality and signature renditions of Dean Martin standards, chef Jack Guerriero built a reputation for taking care of people.

As the owner of Guerriero’s Ristorante on South Street in Morristown, the beloved restaurateur spent more than two decades serving authentic Neapolitan cuisine to about 400 local diners a week before retiring in 2025. “When I wasn’t in the kitchen,” he recalls with a laugh, “I’d walk through the dining room with a glass of wine, singing to the customers. I love seeing people happy.”

For 82-year-old Guerriero, generosity has always been just another ingredient in the recipe. When Hurricane Irene struck Morris County, first responders called with an urgent request: hundreds of displaced residents needed to be fed. Although the restaurant was preparing to close for the day, Guerriero sprang into action.

“We cooked chicken, sausage, eggplant, pasta—whatever we could make. We fed about 500 people,” he says. “I never even thought about charging. They needed food and we made it happen.” His generosity earned him the Key to the City, presented by Mayor Tim Dougherty. But for Guerriero, recognition was never the point.

Over the years, he routinely donated meals to Morristown police retirement ceremonies, delivered food to firefighters working overnight during emergencies and supported countless local charitable events, including Taste of Morristown. 

Guerriero also supported a golf outing at Spring Brook Country Club to benefit Alzheimer’s caregivers. “We raised money not for the patients themselves—but for their family members. We made sure the Alzheimer's patients were looked after for an entire weekend so their caregivers could go off and do something fun. I’ve always believed if you can help somebody, you help them,” he says.

That philosophy became even more personal after Guerriero faced the toughest challenge of his own life. Over the past decade, he battled leukemia with a bone marrow and stem cell transplant, then endured back surgery, and later completed 28 consecutive days of radiation treatments after being diagnosed with prostate cancer. In 2017, doctors gave him only a 10 to 12 percent chance of survival. “I refused to back down,” he says.

Guerrriero’s optimism became contagious. While receiving treatment in the Carol G. Simon Cancer Center at Morristown Medical Center, he often walked the halls playing music from his phone and singing to fellow patients. “I actually had more fun in the hospital than most people,” he jokes. “If I could make somebody else smile, that made me feel better, too.”

Today, Guerriero continues giving back by volunteering at the cancer center whenever he’s asked. Because he’s been through a bone marrow transplant himself, he often meets with patients who are considering the procedure. “I tell them there’s hope,” he says. “Stay positive. Fight hard. You can get through this.” The nurses on the Simon 5 chemo floor consider him to be an extension of their care team. They even created a special staff badge featuring a photo of their favorite volunteer in his chef’s jacket that reads: Jack G., Entertainment Coordinator, Simon 5.

These days, the longtime Morristown resident and Delbarton alum enjoys a quieter pace of life. Guerriero, who learned the finer points of cuisine from his grandmother, cooks meals for himself—usually a steak, pork chop or a bowl of macaroni—and admits he has a weakness for milkshakes. The proud father of three, grandfather of 12 and great-grandfather of one, Guerriero also enjoys dining around town, especially at the Grand Café and The Address.

Looking back, he’s fulfilled every dream he ever had. “I wanted a big family. I wanted to own a restaurant. And I wanted to entertain people. I've been lucky enough to realize all three.”

Then, borrowing a lyric from one of his favorite Sinatra tunes, he croons, “I’ve got the world on a string….”