A veteran of Hans Zimmer's Media Ventures,[3] Mancina has scored over sixty films and television series including Speed, Bad Boys, Twister, Tarzan, Training Day, Brother Bear, Criminal Minds, Blood+, Planes, and Moana.
He arranged many of the songs behind Disney's The Lion King (while Hans Zimmer wrote the orchestral score with Nick Glennie-Smith and Lebo M for the African chants) including the Broadway musical.
Mancina wrote and composed the arrangement of "When You Wish Upon a Star" from 2006 to 2022 for the previous Walt Disney Pictures logo and was co-arranged with and orchestrated by David Metzger.
[6] Additionally in television, he composed score for Criminal Minds and Soldier Of Fortune, Inc. Mancina has contributed to a number of progressive rock projects.
He worked with Emerson, Lake & Palmer, as he coproduced their 1992 album, Black Moon, and he also wrote one song Burning Bridges on this record.