Soft-spoken, reserved and even-keeled.
The Ravens believe Trestman's demeanor will mesh with quarterback Joe Flacco. Do a search for those three attributes -- soft-spoken, reserved and even-keeled -- and chances are you will find them in articles about Trestman as well as Flacco.
"I think personality-wise, they're going to hit it off very well because they're both very smart, they're both very detailed, and they're both very direct in their communication," Ravens coach John Harbaugh said. "Marc, and the way he explains football and the way he talks about it, is very black and white and to the point and clear cut, and Joe will appreciate that kind of communication. So, I think those guys are going to hit it off really, really well."
While Trestman's track record and experience with the West Coast offense were factors in the Ravens hiring him, his ability to connect with Flacco was just as key. The two best periods of success for Flacco -- the 2012 postseason and last season's career highs in touchdowns and passing yards -- have come under Jim Caldwell and Gary Kubiak, play-callers known for their stoic approach to the game.
Flacco wasn't involved in the entire offensive coordinator search, but Harbaugh did call the franchise quarterback a couple of times toward the end of the process when the Ravens were deciding which way to go.
"Joe is on board with it," Harbaugh said. "He's excited about it. He knows Marc's reputation."
Trestman's reputation, especially with quarterbacks, is well-documented. Steve Young, Rich Gannon and Scott Mitchell all credit Trestman as a positive influence in their development.
In 1995, with Trestman as the San Francisco 49ers' offensive coordinator, Young directed the NFL's No. 1 passing attack. In 1997, with Trestman as the Detroit Lions' quarterbacks coach, Mitchell threw for the seventh-most passing yards in the league.
In 2002, with Trestman as the Oakland Raiders' offensive coordinator, Gannon was the NFL's Most Valuable Player.
In 2013, with Trestman as the Bears' coach, journeyman Josh McCown recorded a 109 passer rating, which was 34 points higher than in any of his previous 10 seasons.
"I'm just a guy who loves to coach, coach football, and I certainly enjoy the connection I have with quarterbacks and working with quarterbacks and the entire offense," Trestman said.
Trestman is considered a different breed in coaching circles, which reportedly hasn't always been a good fit. It may explain why he's moved on after one season three times and after two seasons five times.
His background is unlike any other in the league. Trestman went to the University of Miami law school and passed the Florida bar in 1983. He wrote a book in 2010 about his ideologies and philosophies called "Perseverance: Life Lessons on Leadership and Teamwork."
"I like the way [Trestman] thinks, I like the way his mind works," Harbaugh said. "He's got kind of a wide range of depth to his thinking. I know that's going to mesh well with Joe and the way Joe thinks."
Trestman hasn't had a chance to speak to Flacco, whose wife delivered their third child on the day Trestman was hired. Trestman, though, did text the quarterback right away after accepting the coordinator position and agreed to meet up when Flacco's family life settles down.
"I wanted to reach out to him immediately and get connected to him," Trestman said. "I think that's critically important."