Question

What harvard professor advised students to "turn on to the scene, tune in to what is happening, and drop out…"?

Answer 1

The correct answer is Timothy Leary.
He was a famous Harvard professor known for his research on psychedelic therapy. The sentence above is referred to the use of drugs, primarily LSD - he wanted to say that the use of drugs can help us detach from the society and fight its hierarchy in a different way. He was an important figure during the counterculture movement of the 60s in America. 

Answer 2

Timothy Leary is a Harvard professor who advised students to "Turn on to the scene, tune in to what is happening, and drop out."