Robert Waller, also known as EST, is an American rapper and songwriter.
He began his career as a member of Philadelphia-based hip hop collective Three Times Dope, who signed with Arista Records in the late 1980s.
[2][3] Waller then became known for his production and songwriting work, having contributed to the Destiny's Child album Destiny Fulfilled (2004), which was nominated for Best R&B Song at the 48th Annual Grammy Awards in 2006 with "Cater 2 U".
He also worked with the group's lead member Beyoncé on her solo debut, Dangerously in Love (2003).
[4][5][6] Credits are courtesy of Discogs, Tidal, Apple Music, and AllMusic.