Levin's central research interests are in epistemology (reliabilism and Gettier problems) and in philosophy of race.
In his book Sexual Desire (1986), the philosopher Roger Scruton criticized Levin's attempt to show that homosexuality is abnormal, calling it absurd.
[4] Murphy states in Gay Science (1997) that while Levin "more or less accepts that there is a strong biological basis for homoerotic orientation" he nevertheless believes that discrimination against gay people may be defensible on several grounds, including the possibility that there is a biologically based dislike of homosexuality.
[7] Levin agrees with Arthur Jensen and Richard Lynn that white people score higher on IQ tests than black people due to genetic differences—a view that has been criticized by scholars such as Leon Kamin of Princeton University.
[10][11][12] Throughout the 1990s Levin frequently wrote about race differences in intelligence, biology, and morality for the white nationalist publication American Renaissance.