Ramon Eduardo Ruiz would be the first to admit that he is not your typical Mexican American. But he has always known who he is.

Historian, author, and intellectual, Ruiz has established himself through such books as Triumphs and Tragedy: A History of the Mexican People and Cuba: The Making of a Revolution, and in 1998 he was awarded the National Humanities Medal by President Clinton. Now he turns his pen on his own life to offer a personal look at what it really means to be American by birth but Mexican by culture.

Little has been written by or about persons of...