Born in Freetown, Sierra Leone, Kallon earned an Artium Baccalaureus degree from Dartmouth College in 1990.
[2] From 1994 to his judicial appointment, Kallon worked in private legal practice in Birmingham, Alabama.
[4] According to news accounts, Kallon had been recommended for the judgeship by a panel of legal experts assembled by United States Representative Artur Davis.
[4] The United States Senate confirmed Kallon to his judgeship by unanimous consent on November 21, 2009.
[1] On February 11, 2016, President Obama nominated Kallon to serve as a circuit judge of the United States Court of Appeals for the Eleventh Circuit, to the seat vacated by Judge Joel Fredrick Dubina, who took senior status on October 26, 2013.