Was so grateful that my linear algebra professor at Drexel back in 2004 managed to get Strang, the author of our textbook, to take Amtrak down to Philadelphia f

Was so grateful that my linear algebra professor at Drexel back in 2004 managed to get Strang, the author of our textbook, to take Amtrak down to Philadelphia for a guest lecture. Learned more that day than any other, and gladly waited after class to have him autograph my textbook!