He chatted freely with reporters and fans in the crowd. He was serenaded with "SJSU!" throughout his round.
Oberholser was a five-shot winner Sunday at the AT&T Pebble Beach National Pro-Am in California.
Oberholser shot only an even-par 72 to finish at 17-under-par 271, but his challengers never made a serious threat.
"It's really nice," said Oberholser, who also shared the 54-hole lead here two years ago but finished fourth. "It's a stepping stone and hopefully I continue to get better."
Rory Sabbatini was the runner-up at 12-under-par 276 after a closing 2-under 70.
Tied for the lead with Canada's Mike Weir at the start of the day, Oberholser fired a level-par 72 in bright sunshine at the Pebble Beach Golf Links to finish on 17-under 271.
Six ahead with six holes to play, Oberholser bogeyed 13 and 14 as the pressure mounted, but held his nerve over the closing stretch to secure his breakthrough win.
Although he pushed his drive well right at the par-four 15th, the ball bouncing twice on a cart path before ending up to the left of a tree, he struck his second shot to seven feet and sank the birdie putt to restore his five stroke cushion.
His five-shot victory margin matched the tournament's previous best achieved by Lloyd Mangrum in 1948 (after 54 holes), Cary Middlecoff in 1956 (after 54 holes), Jack Nicklaus in 1967 (after 72 holes) and Fuzzy Zoeller in 1986, also after 54 holes.
"To win here is extremely special," a beaming Oberholser told reporters after receiving the winner's check for $972,000. "The walk down 18 at Pebble Beach is something else.
"I never dreamed of winning here, although I certainly dreamed about winning on the PGA Tour.
"It was going to happen sooner or later. It was just a question of time," added the former college student from nearby San Jose State University.
"I was struggling with my golf swing today, especially on the back nine, but I was able to piece it together and get the job done."
Congratulations to Arron on his big win from both the fans of SpartanThunder.com and San Jose State athletics!