On December 13, 2004 died David Wheeler. He was a computer scientist and professor of computer science at the University of Cambridge. Wheeler’s contributions to the field included work on the Electronic delay storage automatic calculator (EDSAC) and the Burrows–Wheeler transform (BWT). He was responsible for the implementation of the CAP computer, the first to be based on security capabilities. In cryptography, he was the designer of WAKE and the co-designer of the TEA and XTEA encryption algorithms together with Roger Needham.
On December 18, 1995 died Konrad Zuse. He was a German civil engineer, pioneering computer scientist, inventor and businessman. His greatest achievement was the world’s first programmable computer; the functional program-controlled Turing-complete Z3 became operational in May 1941. Thanks to this machine and its predecessors, Zuse has often been regarded as the inventor of the modern computer.
On December 19, 1921 was born Adin Falkoff. He was an engineer and computer systems and programming systems designer who was mostly known for his work on the programming language APL and systems for IBM. He was a researcher and manager at IBM Research since 1955 for over forty years before retiring. He collaborated with Ken Iverson from 1960 to 1980 on the design, development, and use of the APL programming language and interactive environment.