Alfred Aho (EngPhys 6T3) has been at the forefront of computer science research for nearly five decades, and was a key member of the Bell Labs team that defined the modern computer programming industry in the 1970s with the development of UNIX and the foundation of lexical processing, language parsing and modern compiler design. His pattern-matching algorithms are run daily on computers around the world, and his textbooks on algorithms and compilers have been used to educate generations of software engineers. He is currently appointed the Lawrence Gussman Professor Emeritus of Computer Science at Columbia University.