Zach Yenser is in his second season as the 49ers assistant offensive line coach. He joined San Francisco after spending three of the previous four seasons (2015-17) as the run game coordinator/offensive line coach at the University of Kansas. Yenser spent the 2018 season as an offensive quality control coach at Southern Methodist University.
In 2019, while working with offensive line coach John Benton, the 49ers offensive line showcased their toughness and depth throughout the season. San Francisco's offense ranked second in the NFL in rushing yards per game (144.1) and fourth in the NFL in total offense (381.1 yard per game). The 144.1 rushing yards per game were the fourth-most by the team since 1990. The offense also had three players rush for over 500 yards for just the second time in franchise history and first time since 1954. The team success on the ground continued in the postseason, as the 49ers offense rushed for an average of 204.0 yards per game. The offensive line faced its share of adversity, as four different starters along the line missed time due to injury, but newcomers OL Daniel Brunskill, OL Ben Garland and rookie OL Justin Skule each stepped in at different points throughout the season.