Mitch Albom.
Tuesdays with Morrie: An Old Man, a Young Man, and Life's Greatest Lesson.
New York: Broadway Books / Random House, Inc., 1997.

Book information at Amazon.com.

Call me a sentimental simpleton (some hard-headed people I respect have given this book negative reviews, and I do not entirely disagree with them - see, for example, the Brothers Judd and the links therein), but I found this book deeply moving, and heartily recommend it to others.