Danny was born to Dan Southwick and Shawn (Southwick) King in Provo, Utah. He attended Timpview High School in Provo, where he lettered in football. As a senior in 1999, Southwick threw for 2,970 yards and 27 touchdowns.
Southwick originally signed with Brigham Young University out of high school, when he elected to take a two-year Mormon mission. Upon returning from his mission, Southwick enrolled at Oregon State University. Southwick then transferred to Dixie State College for a season. From Dixie State, Southwick transferred to the University of Utah, where he walked-on and was listed as the backup quarterback going into fall camp with the Utes. Southwick then went back to Dixie State. He played his senior season of college football at Occidental. Southwick's college statistics, excluding post-season play, include 271 completions out of 478 passes (57%) for 3,804 yards, and 29 touchdowns with 23 interceptions. As a starter in college, during the regular season, Southwick compiled a record of 13 wins and 5 losses.
Southwick began his professional career signing with the Louisville Fire of the af2. After finishing the season with the Fire, the franchise folded as well as the Arena Football League.
In 2009, Southwick signed with the Oakland Raiders, but was released prior to the preseason.
On February 25, 2011, Southwick was assigned to the Dallas Vigilantes, but he was placed on reassignment just 3 days later on February 28.
On May 16, 2011, he signed with the Tampa Bay Storm. On July 16, 2011, Southwick made his first career arena football start for the Tampa Bay Storm, where he was eventually replaced by Matt Grothe due to his ineffective play.
In April 2014, he was named the starting quarterback for the Portland Thunder.
On April 7, 2015, Southwick was assigned to the Spokane Shock.
On May 13, 2015, Southwick was traded to the Los Angeles KISS for future considerations.
He was assigned to the Portland Thunder on February 1, 2016. The Thunder changed its name to the Portland Steel on February 24, 2016. He was placed on reassignment by the Steel on April 25, 2016.
On May 26, 2016, Southwick was assigned to the Los Angeles KISS. On June 25, 2016, he was placed on reassignment.
On July 6, 2016, he was assigned to the Orlando Predators.
On May 23, 2017, Southwick was assigned to the Cleveland Gladiators.
Stats from ArenaFan
Southwick is the stepson of talk show host Larry King.