Quinn's 54-hole total of 3-under 213 left him two strokes clear of ex- major league pitcher Rick Rhoden, the Celebrity Tour's all-time win leader who himself captured this event five times.
Rhoden shared the top spot with Quinn after Saturday's round, but bogeyed two of the first four holes Sunday at Edgewood Tahoe Golf Course to fall off the pace.
Meanwhile, Quinn left a five-foot birdie putt short at the opening hole but rebounded by running off four straight birdies beginning at No. 2.
'I just felt great starting out today,' said Quinn. 'I played really well the first five holes, as good as I've ever played.'
Quinn's hot streak lifted him to 6-under for the tournament. However, he pulled his approach badly at the sixth and made bogey, then dropped another shot at the ninth when he three-putted.
Another bogey at the 13th was wiped away by a birdie at the 15th, where Quinn stuffed his approach inside five feet. He hit a wayward tee shot on his way to a bogey at the par-3 17th, but a routine two-putt par at the par-5 18th was more than enough to clinch the victory.
The win was the second of the season for Quinn, who held off Rhoden to earn the Las Vegas Celebrity Classic title back in March. Quinn, who finished three shots in front of runner-up Rhoden last year in Lake Tahoe, was also the American Century champ in 1992.
Quinn collected the $100,000 first prize, $10,000 of which he will donate to a scholarship fund for families of New York City firefighters. Three members from the FDNY played this week in the tournament, and Quinn said he was looking forward to spending some time with them.
'I tip my hat to them,' he said. 'It's great to have them a part of this event and I'm going to go have a couple of beers with them now.'
Rhoden, the winner here every other year from 1991 to '99, closed with a 1-over 73 to finish second at 1-under-par 215.
'[Quinn] was playing awfully good, and I just didn't make anything happen all day,' said Rhoden, who will attempt to qualify for next year's Senior PGA Tour. 'I hit the ball a lot better today than I did yesterday. I couldn't make anything go in.
'I think I three-putted four times, had four bogeys and I was only in trouble one time and that was on the second hole; I had a real hard two-putt. But after that, I gave away three shots today.'
Former NFL quarterback Billy Joe Tolliver turned in the day's best round of two-under 70 to finish in third place at even-par 216. Steve Bartkowski, another ex-QB, shot 71 to finish at two-over 218 with actor Jack Wagner, who carded a 74.
Former tennis star Ivan Lendl (75) was alone in sixth place at three-over par, followed by ex-Miami Dolphins safety Dick Anderson (76) at four-over and former NHL goalie Grant Fuhr (72) at plus-five.
Former NFL placekicker Al Del Greco, the 2000 American Century champion, closed with a 71 to finish ninth at six-over par.