This article examines Frank Tannenbaum's engagement with Mexico in the crucial years following the Revolution of 1910–1920 and his first visit to the country in 1922. Invited—and feted—by the government and its powerful labor allies, Tannenbaum soon expanded his initial interest in organized labor and produced a stream of work dealing with trade unions, peasants, Indians, politics, and education—work that described and often justified the social program of the Revolution, and that, rather surprisingly, continued long after the Revolution had lost its radical credentials in the 1940s. Tannenbaum's vision of Mexico was culturalist, even essentialist; more Veblenian than Marxist; at times downright folkloric. But he also captured important aspects of the process he witnessed: local and regional variations, the unquantifiable socio-psychological consequences of revolution, and the prevailing concern for order and stability. In sum, Tannenbaum helped establish the orthodox—agrarian, patriotic, and populist—vision of the Revolution for which he has been roundly, if sometimes excessively, criticized by recent “revisionist” historians; yet his culturalist approach, with its lapses into essentialism, oddly prefigures the “new cultural history” that many of these same historians espouse.