Career

He played at the collegiate level at Florida State University

Florida State University

The Florida State University is a space-grant and sea-grant public university located in Tallahassee, Florida, United States. It is a comprehensive doctoral research university with medical programs and significant research activity as determined by the Carnegie Foundation...

 and the University of Oklahoma

University of Oklahoma

The University of Oklahoma is a coeducational public research university located in Norman, Oklahoma. Founded in 1890, it existed in Oklahoma Territory near Indian Territory for 17 years before the two became the state of Oklahoma. the university had 29,931 students enrolled, most located at its...

.

Mankins was drafted in the twelfth round of the 1966 NFL Draft

1966 NFL Draft

The 1966 National Football League Draft was held on November 27, 1965. It was the last draft in which the NFL and the AFL drafted their players separate of one another. As a result, many players selected by teams from both leagues would choose to play for the more established NFL, or in a rarer...

 by the Green Bay Packers

Green Bay Packers

The Green Bay Packers are an American football team based in Green Bay, Wisconsin. They are members of the North Division of the National Football Conference in the National Football League . The Packers are the current NFL champions...

. He had also been drafted in the sixth round of the 1966 American Football League Draft

1966 American Football League Draft

-Round One:-Round two:-Round three:-Round four:-Round five:-Round six:-Round seven:-Round eight:-Round nine:-Round ten:-Round eleven:-Round twelve:-See also:* 1966 NFL Draft*...

 by the Miami Dolphins

Miami Dolphins

The Miami Dolphins are a Professional football team based in the Miami metropolitan area in Florida. The team is part of the Eastern Division of the American Football Conference in the National Football League...

. Mankins would go on to play for the Atlanta Falcons

Atlanta Falcons

The Atlanta Falcons are a professional American football team based in Atlanta, Georgia. They are a member of the South Division of the National Football Conference in the National Football League...

.

After playing in the NFL, Mankins would play 3 seasons in the Canadian Football League

Canadian Football League

The Canadian Football League or CFL is a professional sports league located in Canada. The CFL is the highest level of competition in Canadian football, a form of gridiron football closely related to American football....

. With the Ottawa Rough Riders

Ottawa Rough Riders

The Ottawa Rough Riders were a Canadian Football League team based in Ottawa, Ontario, founded in 1876. One of the oldest and longest lived professional sports teams in North America, the Rough Riders won the Grey Cup championship nine times. Their most dominant era was the 1960s and 1970s, a...

 from 1968 to 1970, he would win two Grey Cup

Grey Cup

The Grey Cup is both the name of the championship of the Canadian Football League and the name of the trophy awarded to the victorious team. It is Canada's largest annual sports and television event, regularly drawing a Canadian viewing audience of about 3 to 4 million individuals...

 championships. He was traded to the Edmonton Eskimos

Edmonton Eskimos

The Edmonton Eskimos are a Canadian football team based in Edmonton, Alberta. They currently play in the West Division of the Canadian Football League . Edmonton is currently the third-youngest franchise in the CFL, although there were clubs with the name Edmonton Eskimos as early as 1895...

in 1970, finishing his football career there.