Scientist. He was the first to put logarithms on a scale, the inventor of the terms cosine, cotangent, cosecant and the first publisher of logs of trigonometric functions. He devised many mathematical instruments, including the surveyor's chain, and improved the cross-staff, publishing the work "The Description and Use of the Sector, the Crosse-Staffe and other Instruments" in 1623. He also observed the variation of the compass. He was rector at St. George the Martyr from 1615 to 1627 and is on the list of rectors in the church. He was Gresham Professor of Astronomy from 1619 till his death in the College.
Bio by: Pat Ballew