Andy Morez
The current world record holder in the 400m is Wayde van Niekerk from South Africa, with a time of 43.03 seconds set at the 2016 Rio Olympics.
One African American male who holds a T&F world record is Michael Johnson in the 400m dash.
No, he retired from athletics in 2001. He still holds the 400m world record set in 1999.
Chewbacca
La'Vere Corbin-Ong
World Record 400m Individual Medley Michael Phelps (USA) August 9, 2008 Time: 4:03.84
The world record holder for the women's 400m is Wayde van Niekerk of South Africa, who set the record of 43.03 seconds on August 14, 2016, at the Rio Olympics.
Stephanie Rice
Michael Johnson
dont have a clue
Michael Johnson of the United States is the current 400m record holder. He ran 43.18 on 26 August 1999 in Seville.
A boy called Chris Kirkland not sure how long it took him though.