Roman came to the 49ers with Jim Harbaugh prior to the 2011 season after serving as an offensive assistant at Stanford the previous two years.
Roman was key in turning an offense around that had struggled under quarterback Alex Smith in part because of a lack of consistency year-to-year in the offense. The 49ers had nine offensive coordinators dating back to 2003 before his arrival.
Under Roman, the offense took a major step forward, tying the NFL record for fewest turnovers by committing just 10, supplementing the team's elite defense en route to a 13-3 regular season and trip to the NFC Championship game. Roman also helped the unit field the eighth-best rushing attack, averaging 127.8 yards per game behind a talented and physical offensive line.
The 49ers scored 23.8 points per game, good for tenth in NFL in 2011. It was their best scoring season since 2003, when they finished 7-9 and averaged 24 points per game under head coach Dennis Erickson and coordinator Greg Knapp.
With the emergence of Colin Kaepernick, Roman's offense improved to score over 26 points per game in the regular season, before scoring 45, 38 and 31 points in three postseason games, respectively. The unit set a 49ers' postseason record with by accumulating 579 yards against Green Bay in the divisional round.
Often referred to as the "Mad Scientist," Roman's complex running and blocking schemes aided San Francisco's offense to becoming one of the most difficult to defend with Kaepernick at the helm. After supplanting Smith as the starter midway through the season, Kaepernick registered a 98.3 passer rating with 10 touchdowns to three interceptions. He also rushed for 415 yards and five scores.
With defensive coordinators being able to take a full offseason to figure out how to stop read-option style offenses, San Francisco hired defensive guru Eric Mangini this offseason to aid Roman and Harbaugh in staying ahead of the curve.
The contract extension doesn't prevent Roman from interviewing from potential head coaching positions. He was viewed as a viable candidate for a number of jobs last offseason, but missed out on the opportunity to interview because San Francisco was still in the midst of its Super Bowl run.