Laurence Lampert is a leading scholar in Nietzsche studies. He received both his master's and doctorate degrees from Northwestern University (in 1968 and 1971).
He taught at Indiana University-Purdue University at Indianapolis for over thirty years and is now a professor emeritus there.
An informative interview with Laurence Lampert, conducted by the Nietzsche Circle, can be found here (pdf).
I found Lampert an invaluable commentator as I read my way through Beyond Good and Evil. His writing lacks the charm of his subject, but I suspect I would have understood Nietzsche half as well without him. Lampert is deeply intelligent, accessible and unpretentious. He even made me appreciate Leo Strauss (an event I've long considered impossible.) Recommended for the assiduous.