Banks' work centers around string theory and its applications to high energy particle physics and cosmology.
[4] He was several times a visiting scholar at the Institute for Advanced Study in Princeton (1976–78, 1983–84, 2010).
Banks proposed a conjecture known as Asymptotic Darkness - it posits that the physics above the Planck scale is dominated by black hole production.
Rather, Banks argues that different asymptotics correspond to different models of quantum gravity.
[6] Many of his arguments for this and other ideas are contained in his paper "A Critique of Pure String Theory: Heterodox Opinions of Diverse Dimensions."