Ronald Graham was an influential American mathematician known for his work in various fields, including combinatorics, number theory, and computer science. He was born on October 31, 1935, and made significant contributions to the understanding of Ramsey theory and algorithmic analysis. Graham was also recognized for his collaboration with other mathematicians, including Donald Knuth and John H. Conway. He served as a professor at UC San Diego and was involved in promoting mathematics through outreach and education. His legacy includes the famous Graham's number, which illustrates the concept of large numbers in mathematics.