Here is a range of people who have made a positive contribution to the world through their work in Computer Science. They are all at time of writing (April 2015) Alive and working.

• 
  Richard Stallman
• 
  Anne-Marie Imafidon
• 
  Marrise Mayer
• 
  Larry Page

• Richard Stallman - launched the GNU Project in September 1983
• Anne-Marie Imafidon - 19 in June 2010, she became the youngest ever graduate with a masters degree from Oxford University
• Marissa Mayer - Google's first female engineer
• Larry Page - Co-Founder of Google