He made his MLS debut in 2006, and scored his first professional goal on August 1, 2006, in the Lamar Hunt U.S. Open Cup in a 2-0 fourth-round win over Dallas Roma.

(Beckham had chosen the number 23 because 7 was already taken when he was transferred to Real Madrid by Raul, and also because he admires Michael Jordan).

On February 15, 2008, Kirk was traded to D.C. United in exchange for the rights to Greg Vanney[1] He scored his first career league goal on August 23, 2008, in a 3-0 DC win over the Colorado Rapids.

[3] Kirk trialled with the Portland Timbers, looking to secure a place on their roster prior to their first season in Major League Soccer in 2011, but suffered a hamstring injury in a pre-season game against Ventura County Fusion, and was not offered a contract by the team.

Kirk subsequently signed with Rochester Rhinos of the USL Pro league on March 25, 2011.