It’s Friday night, and Bellagio is jumping. The tables – in the casino, the nightclubs and the restaurants – are packed. Bob Mancari enjoys a rum and Diet Coke and a ringside seat in the lounge at FIX, which is appropriate because in Vegas, Mancari is the ultimate Mr. Fix-It.

He’s the casino host with the most. Need tickets to the big fight? Done. Reservations at a packed restaurant? Pick a time. VIP seating in the hot nightclub? Right this way. One of Bellagio’s villas, the most sumptuous digs on The Strip? He’ll make the call. Bear in mind though, that to get Mancari assigned to your case, you’d best be exceptionally well-known and/or alarmingly wealthy.

Mancari is as famous in Las Vegas as the famous people he looks after. “Who is that guy?” is a common refrain as he breezes past velvet ropes in the company of the world’s most recognized athletes and entertainers, like Michael Jordan, Leonardo DiCaprio and Luke and Owen Wilson. Among the 400 guests at Mancari’s 40th birthday party/poker tournament were Matt Damon and Ben Affleck.

Mancari, now 42, is a dead ringer for Detective Vic Mackey, the bald, buffed, badass cop portrayed by Michael Chiklis in TV’s “The Shield.” On the show, Mackey plays by his own rules. At Bellagio, you play by Mancari’s.

Nightlife in Las Vegas is fueled by adrenaline and alcohol, a combustible combination, especially for people who take the tagline, “What happens in Vegas, stays in Vegas” as a license to behave in ways they never would otherwise. “My clients set their limits,” says Mancari. “It is my job to see that they stick to those limits.”

Mancari has seen his share of high rollers win multi-millions in a night. However, if a client sets a cap of $500,000 and lady luck turns out to be frowning instead of smiling, Mancari may allow a client to stretch but he will never let him snap. “Better to tell a guy he’s cut off that night,” says Mancari, “than to explain the next morning why you let him blast past his limit.”

Eschewing e-mail and refusing a BlackBerry, Mancari prefers the personal touch. The cell phone is the tool of his trade, and Mancari’s rings incessantly. When it rings at night, it is typically a last-minute request. When it rings in the morning, it is often an apology for the night before.

Mancari is big on respect, a virtue his parents drilled home at an early age. “Nobody impressed my dad,” says Mancari of his father, Joe, who saw his share of big shots working in security for Caesars. “He’d show respect, but he would not fawn.” Mancari’s mother, Marie, was a stay-at-home mom, as are his three sisters, who live and remain close. “My mother was an angel. She found the good in everyone.”

Born and raised in Las Vegas, Mancari started as a dealer at the Golden Nugget and worked his way up to floorman, pit boss and ultimately casino host at Treasure Island when it opened in 1992. He came to Bellagio in 2000 as Director of Casino Marketing, though he considers what he does, “relationship marketing.”