| Ronald Graham |
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He holds the posts of Chief Scientist at the California Institute For Telecommunication And Information Technology (also known as Cal-(IT)2), and Irwin and Joan Jacobs Professor at the Department of Computer Science and Engineering of the University Of California, San Diego (UCSD). He was born in Taft , California . In 1962 , he got his Ph.D. in Mathematics from the University Of California, Berkeley . A 1977 paper of his discussed a problem in Ramsey Theory , and gave a Large Number as an upper bound for its solution. This number has since become famous as the largest number ever used in a serious mathematical proof (and is listed in the '' Guinness Book Of Records '' as such), and is now known as Graham's Number . Graham popularised the concept of the Erdős Number , named after the highly prolific Hungarian mathematician Paul Erdős (1913 - 1996). A mathematician's Erdős number is the number of links away from Erdős they are, where mathematician A is linked to mathematician B if they have co-authored a paper together. Graham's Erdős number was 1. Not only had he co-authored a paper with Erdős, but he was also a good friend. Erdős often stayed with him, and let him look after his mathematical papers and even his Money for him. Graham was featured in " Ripley's Believe It Or Not " for being not only "one of the world's foremost mathematicians", but also "a highly skilled trampolinist and juggler", and past president of the International Jugglers Association . In 2003 , Graham won the American Mathematical Society 's annual Steele Prize for Lifetime Achievement. The prize was awarded on January 16 that year, at the Joint Mathematics Meetings in Baltimore , Maryland . As of 2003 , he has published about 300 papers, and five books including '' Concrete Mathematics '' with Donald Knuth . He is married to Fan Chung Graham (known professionally as Fan Chung ), who is the Akamai Professor in Internet Mathematics at the University of California, San Diego. He has two children — a daughter, Che, and a son, Marc — from an earlier marriage. SEE ALSO EXTERNAL LINKS The following were all used as references.
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