Dr. Ralph Winter, recognized by TIME magazine in 2004 as one of America's 25 most influential evangelicals, has died. He was 84. Winter died Wednesday, 20 May at his home in Pasadena after a seven-year battle with multiple myeloma and after additional struggles with lymphoma since early February.

Many of the accomplishments of Ralph Winter's long career as a missionary, mission professor and "mission engineer" stemmed from his conviction that Christian organizations accomplish more when they cooperate in strategic ways. It was at the 1974 Lausanne International Congress on World Evangelization that Winter shared the concept of "unreached people groups" that significantly influenced evangelical mission energies ever since.