"I usually talk to him every couple of weeks," Shumpert told ESPNNewYork.com on Tuesday. "He usually just checks on me or I check on him. It's always going to be good."
Jarrett Jack is having a strong season for the Warriors, averaging 13.7 points on 47 percent shooting.
Jack, 29, and Shumpert, 22, didn't overlap at Georgia Tech, but they became friends during Shumpert's recruiting visits.
"He's got good advice," Shumpert said. "He tries to help you so you don't make mistakes that he made. He's just a humble guy; he's just a great guy to be around."
That summer in 2011, as well as last summer, Shumpert worked out with Jack back at their alma mater in Atlanta. Shump said Jack shares his "ultra competitiveness" and pushes him in every drill. Through his recent return from knee surgery, Shumpert has taken some valuable advice from his friend and mentor.
"He told me, 'Just don't be too thirsty to try to do too much,'" Shump said. "'Come in and ease your way in. Just do the things that you know you've got to do.' He's like, 'Your job is to defend, so just do your job and everything else, just let it come to you.'"
While Shumpert continues to find his form, Jack is having one of the best seasons in his eight-year career, averaging 13.7 points and 5.9 assists. On Feb. 22, in a win over the league-leading Spurs, he poured in 30 points and dished out 10 assists.
"He's playing great," Shumpert said. "He's playing really well, but that's the type of guy he is. Jarrett takes what the defense gives him and at the end of the game, it'll sneak up on you that he's got 20 (points). I'm happy for him."
Jack isn't the only member of the Warriors who's connected to the Knicks in some way. Here are six others:
1. Mark Jackson: The Brooklyn native started his 17-year career in New York, winning Rookie of the Year honors in 1988 after averaging 13.6 points, 10.6 assists, and 2.5 steals per game and leading the Knicks back to the playoffs. He spent two stints in New York, covering 6½ seasons.
2. David Lee: The power forward spent the first five seasons of his eight-year career in New York, where he became a first-time All-Star in 2010. The Knicks signed and traded Lee in the summer of 2010 to make room for Amar'e Stoudemire.
3. Stephen Curry: The Knicks were eying Curry in the 2009 draft with the No. 9 pick -- as the team needed a point guard -- but the Warriors snatched him up right before. Curry still hears about it. "Whenever I'm meeting New York fans, they remember the '09 draft," he said.
4. Klay Thompson: Similar to Curry, Thompson was coveted by the Knicks in the 2011 draft because they needed a shooter. But Golden State chose him at No. 11, and New York had the 17th pick. His older brother, Mychel, played with the Knicks last preseason.
5. Richard Jefferson: If you can believe it, it has been 10 years since the Nets were in the Finals. Those 2002 and '03 teams featured many dishes from Jason Kidd to Jefferson for jump shots and transition dunks.
6. Andrew Bogut: With not the most pleasant connection comes Bogut and Stoudemire. On April 3, 2010, when the then-Bucks center went up for a fast-break dunk, STAT touched him on the back and he came crashing down, suffering a broken hand, dislocated elbow and sprained wrist. The video is not pretty.