Through the years, Parcells and Jennings have developed a tight bond. The Hall of Fame coach and former Miami Dolphins vice president of football operations would regularly ride in a golf cart with Jennings on the back fields at Roger Dean Stadium.
"It's been a blessing to foster a relationship with him," Jennings said. "The lessons, although from different sports, it's about leading teams, leading men. It's about the components of the discipline of athletes. All the things that go with it, it's really been a blessing to me."
Parcells offered Jennings some advice.
"The central theme is, make sure you're in charge and do it your way," Jennings said.
Jennings is making the transition from general manager to manager of the team. He is not assuming two responsibilities. His focus is entirely on the baseball team, not being an executive.
Michael Hill is the president of baseball operations, in charge of personnel matters. Hill formerly was a general manager. And Mike Berger is the assistant GM. He is not sliding into Jennings' former role.
Jennings and Hill are under contract through 2018. If managing doesn't work out, Jennings is expected to return to his GM post.
Parcells has experience as an NFL executive and coach.
"He talked about a few things, and shared some of his first-time experiences being an NFL first-year coach," Jennings said. "Because so many of the stories and the things that he shared, you can cross over. And they do cross over."
Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter @JoeFrisaro and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.