The prominent academic and public intellectual Niall Ferguson posted an “unqualified apology” to his blog Saturday after coming under fire for making seemingly anti-gay remarks at a recent public appearance.

Ferguson, a historian at Harvard University and regular contributor to Newsweek, told attendees of the Tenth Annual Altegris Conference in Carlsbad, Calif., that the mid-century British economist John Maynard Keynes “didn’t care about future generations” because “he was a homosexual and was married to a ballerina, with whom he likely talked of ‘poetry’ rather than procreated,” according to a financial journalist who attended the conference....