While taking night classes at [[Columbia University]], he became interested in philosophy through the works of [[John Stuart Mill]]. When he learned that Mill had read [[Plato]], Adler studied the writings of Plato as well. | While taking night classes at [[Columbia University]], he became interested in philosophy through the works of [[John Stuart Mill]]. When he learned that Mill had read [[Plato]], Adler studied the writings of Plato as well. |