SPEAKER: Over the years, CS50 had a variety of notable guest lecturers. One of them was Steve Ballmer, who was the CEO of Microsoft from 2000 until 2014. 

STEVE BALLMER: This is CS50. 

SPEAKER: During this lecture, Steve talks about his experience at Harvard, his friendship with Bill Gates, and how for him, things he did outside of class mattered even more than the classes themselves. His lecture was followed by Q&A, during which CS50 students had a chance to ask Steve insightful questions about his decision to drop out of business school, his stances on current problems with technology, the ways he's using his experience with Microsoft in his other enterprises, and many more. Check it out by searching "CS50 Lecture by Steve Ballmer" on YouTube.