Dr. Amanda Blake Waller is a character published by DC Comics. She first appeared in Legends #1 in 1986, and was created by John Ostrander, Len Wein, and John Byrne. Despite not possessing any superpowers, she has persistently proven herself a powerful foe of the superheroes of the DC universe, and in 2009, Amanda Waller was ranked as IGN's 60th Greatest Comic Book Villain of All Time.
The people most responsible for shaping the character in her earliest appearances were John Ostrander and Kim Yale in the pages of the second Suicide Squad series in the late 1980s.
Nicknamed "the Wall", she is a former congressional aide and government agent often placed in charge of the Suicide Squad, a semi-secret government-run group of former supervillains working in return for amnesty. She later served as Secretary of Metahuman Affairs under President Lex Luthor, before being arrested in the wake of Luthor's public fall from grace. Waller was recently reassigned to the leadership of Checkmate as White Queen, but has been forced to resign because of her involvement in Operation Salvation Run.
Amanda has been established as a widow who escaped Chicago's Cabrini–Green housing projects with her surviving family after one of her sons, one of her daughters and her husband were murdered, Waller eventually obtained a doctorate in political science (as revealed in Checkmate v.2 # 1 where she is addressed as "Doctor Waller") and became a congressional aide. During that work, she discovered the existence of the first two incarnations of the Squad. Taking elements from both of these, she proposed the development of its third incarnation to the White House and was placed in charge upon its approval.
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Official Site: DC Comics
Links: Waller's Wiki Article Superman Homepage CBR Spotlight