He has worked with Shawn Lane, Garaj Mahal, Dapp Theory, Steve Coleman, Maxwell, Meshell Ndegeocello, Blacksheep, Phil Upchurch, David Fiucynski and Screaming Headless Torsos, Kai Eckhardt, Anthony Tidd's Quite Sane, K'Alyn, Angela Bofill and George Duke.

[1] Rickman was lead singer and drummer for Garaj Mahal from 2007 to 2011 and his rock band Big Mouth featuring guitarist Leonard Stevens.

King, George Benson, Curtis Mayfield, Cannonball Adderley, John Lee Hooker, Grover Washington Jr., Lenny Breau, and Dizzy Gillespie.

[3] In 1989, Rickman traveled from his hometown, Washington, D.C., to Los Angeles, California, at the request of his father, who introduced him to owner of Third Stone Records and American cinematic music director, Richard Rudolph.

Rudolph, known as "Dick" or to his friends and family as "Dickie" was the former husband of Minnie Riperton who Phil Upchurch, Rickman's father, had worked in the short-lived band, Rotary Connection in the 1960s.

Warner/Chappell Music, Inc. signed Rickman to a publishing deal and gave him an advance, used to cover an entertainment attorney, transportation and studio expenses during the remainder of his time in Los Angeles during the late 80s and early 90s.

In the final months of 1992, Jamie Brown (owner of Sister2Sister Magazine) recommended Rickman to Kim Jenkins of Ardent Studios in Memphis, Tennessee.

Earl placed him with rising star Shawn Lane, whom Rickman instantly recalled from a Guitar Player Magazine article entitled "Unknown Greats" which he had read in years prior.

Eventually the group toured the US with Robben Ford and released Shawn Lane's Powers of Ten album which was produced by the legendary Andy Johns.

Producer Angelo Earl relocated to Los Angeles to work with him, but they both returned to their hometowns following a devastating 6.7 magnitude earthquake in January 1994.

[5] In 2011 Rickman was selected as drummer for the Tribute To Miles 2011 European tour which featured Marcus Miller, Herbie Hancock and Wayne Shorter.