Here is a brief and fascinating address about Ludwig von Mises the man by his widow Margin von Mises. The remarks were recording live in 1985 during an event celebrating the republication of Mises' book Liberalism.
What I find especially interesting about Mrs. Mises' talk is her desiring to bring out the humanitarian side of her husband. He did this, said his wife, by lifting "economic science out of a mechanistic rut." For those who think Austrian economics necessarily fosters cold, uncaring, selfishness, I encourage you to listen to Margit's biographical vignettes about the great economist.