Computer Scientists Ada Lovelace Mathematician and scientist, often considered to be the first computer programmer. Alan Turing British mathematician, cryptanalyst and computer scientist. Barbara Liskov “Modularity based on abstraction is the way things get done.” Clarence Ellis The first African American to obtain a PhD in computer science. Donald Knuth American computer scientist, known best for his book 'The Art of Computer Programming'. Edsger Djikstra Dutch computer scientist known mainly for the Djikstra algorithm. Grace Hopper American computer scientist and inventor of the first compiler. John von Neumann Hungarian American computer scientist known for stored program concept. Marvin Minsky “You don’t understand anything until you learn it more than one way.” Shafi Goldwasser An American-Israeli computer scientist.