During your business education, you'll sample some of the rich trove of ideas and insights he contributed (he wrote 39 books and authored hundreds of articles). And he was still contributing late into his 90s.
Professor Drucker passed away in 2005. He was still lecturing and writing up until that last day.
Professor Drucker was especially concerned about the "human" side of management. Every discussion about leadership and management was liberally sprinkled with terms like "trust" and "responsibility."
Below is a video link where Professor Drucker talks about leadership and responsibility. Listen carefully. Remember, he's over 90 and has kept his Austrian accent. Enjoy.