He is a professor of philosophy at New Mexico State University, where he occupies the Richard L. Hedden Endowed Chair in Advanced Philosophical Studies.

Prior to his professorship at NMSU Prof. Walker taught at McMaster University in the department of philosophy and the Arts & Science Programme.

He is the author of Happy-People Pills for All (Oxford: Blackwell Press, 2013) and Free Money for All (New York: Palgrave, 2016).

Professor Walker is a consequentialist who argues that humans have a responsibility to perfect themselves in the realm of morality and virtue.

He also co-authored an influential piece about the nexus between transhumanism and religion, with Heidi Campbell.