Biography:The first African-American coach in the history of Major League Baseball. During the time that American baseball was segregated, O'Neil worked for many years in the Negro American League with the Kansas City Monarchs.
Helping to renew interest in his era of baseball, O'Neil had a major hand in establishing the Negro Leagues Baseball Museum in Kansas City. He also gained national fame though Ken Burn's 1994 documentary miniseries "Baseball".