Wil van der Aalst - business process management, process mining, Petri nets Hal Abelson - intersection of computing and teaching Serge Abiteboul - database theory Samson Abramsky - game semantics Leonard Adleman - RSA, DNA computing Manindra Agrawal - polynomial-time primality testing Luis von Ahn - human-based computation Alfred Aho - compilers book, the 'a' in AWK Amos Nuwasiima - PHP Programming book Frances E. Allen - compiler optimization Alexander Scaranti - Image Processing, Image Retrieval Gene Amdahl - supercomputer developer, founder of Amdahl Corporation Tom Anderson[disambiguation needed] - dependability, fault-tolerant computing A. Annerl - multidimensional processing, computational complexity theory Andrew Appel - compilers text books Sanjeev Arora - PCP theorem John Vincent Atanasoff - computer pioneer

125,000 AU: maximum extent of influence of the Sun's gravitational field (Hill/Roche sphere). beyond this is true interstellar space. This distance is roughly 1.8-2.0 light-years.

In 2005, Nasrat Parsa was invited to perform at a concert in Vancouver on the occasion of Mother’s Day, opening a comprehensive tour that was scheduled to include several cities in North America. At the height of his popularity, and on the occasion of promoting his upcoming album Dil, the singer flew to Canada where he performed to a large crowd of fans, some of whom saw him live on stage for the first time.

In 2006 Hamilton started playing sporadic acoustic concerts around the Philadelphia area billed as ""Tom Hamilton's American Babies"", mainly as a way to stay occupied between Brothers Past tours. As the internal relationships in Brothers Past disintegrated and his musical tastes changed Hamilton focused more on acoustic oriented music and decided to make a new band geared towards his new muse. American Babies was formed in 2007 and soon after they released a self-titled album. This was followed by their sophomore release Flawed Logic in 2011 and third album Knives and Teeth on October 15, 2013. In 2016, American Babies released their forth album, An Epic Battle Between Light & Dark. Tom described the record as a discussion of both what it is like to experience depression and what it takes to maintain hope while in the midst of it.