[1] His father, Dave Johnson, pitched in MLB for five seasons, including three for Baltimore, and is now a broadcaster on MASN, which airs Orioles and Nationals games.

He split 2006 between the Ogden Raptors (14 starts) and Jacksonville Suns (two relief appearances), going a combined 5–5 with a 3.67 ERA.

On July 30, he was traded with minor leaguer Josh Bell to the Baltimore Orioles for George Sherrill.

[6] Johnson had his contract purchased by the Orioles on June 3, 2012, but was immediately optioned to the Triple-A Norfolk Tides.

On August 8, 2012, he started and won his first game against the Seattle Mariners, 23 years to the day after his father pitched his first victory for the Orioles.

On January 27, 2015, Johnson re-signed with the Orioles on a new minor league contract that included an invitation to spring training.

On January 29, 2016, Johnson signed a minor league contract with the Texas Rangers, with an invitation to Spring Training.

On March 4, 2017, Johnson signed a minor league contract with the Baltimore Orioles organization.