One of the most experienced linemen on the team, Jonathan was the starter for most of the past three seasons at right tackle. An imposing figure, Dunn has the size and physical ability to be a dominating force. In 2004, he gained the consistency and intensity coaches were looking for.

Jonathan earned All-American honors from Super Prep, Prep Star and Tom Lemming's Prep Football Report as a senior at Tallwood High School. He was rated the No. 35 offensive line prospect in the nation by Super Prep and the ninth-best player in Virginia. Dunn was listed as the best offensive lineman in the state and the seventh-best overall prospect in Virginia by The Roanoke Times. He lettered three seasons in football and saw most of his action as an offensive tackle. He also received some playing time at defensive tackle and as a long snapper. Jonathan earned All-District honors his junior and senior seasons and was named All-Eastern Region in his final year. He had eight tackles and two sacks in limited defensive duty in 1999.

Dunn worked at right tackle with the scout team while redshirting in 2000 at Virginia Tech. He played in ten games as a redshirt freshman in 2001, seeing action on offense in nine of those contests. He played in every game in 2002, starting seven contests at the right tackle position. Jonathan collected 22 knockdowns and graded 80.3% for blocking consistency that campaign.

In 2003, he started all twelve games he played in and would go on to register 23 knockdown blocks and grade 83% while participating in 716 plays that year. As a senior, he earned secondteam All-Atlantic Coast Conference honors. He again lined up at right tackle, making a careerhigh 34 knockdowns. Dunn was on the field for 793 plays as a senior and received an 82% grade for blocking consistency.