Invention of the telephone useful and widespread apparatus it is now. The telephone exchange was an idea of the Hungarian engineer Tivadar Puskás (1844–1893) in 1876, while he was working for Thomas Edison on a telegraph exchange. Puskás was working on his idea for an electrical telegraph exchange when Alexander Graham Bell received the first patent for the telephone. This caused Puskás to take a fresh look at his own work and he refocused on perfecting a design for a telephone exchange. He then got in touch with the U.S. inventor Thomas Edison who liked the design. According to Edison, "Tivadar Puskas was the
David Wheeler (computer scientist) David Wheeler (computer scientist) David John Wheeler FRS (9 February 1927 – 13 December 2004) was a computer scientist and professor of computer science at the University of Cambridge. Wheeler was born in Birmingham and gained a scholarship at Trinity College, Cambridge to read the Cambridge Mathematical Tripos, graduating in 1948. He completed the world's first PhD in computer science in 1951. Wheeler's contributions to the field included work on the Electronic delay storage automatic calculator (EDSAC) and the Burrows–Wheeler transform (BWT). Along with Maurice Wilkes and Stanley Gill he is credited with the invention of the subroutine (which they