His elder brother Boaz Kiplagat Lalang is a middle distance runner, who specialises in the 5000 metres.

Lalang was drafted into the U.S. Army World Class Athlete Program on a track to becoming a U.S.

[5] Lalang won 2011 NCAA Division I Cross Country Championships titles.

In 2013 he won both 5,000 and 10,000 metres at the 2013 NCAA Division I Outdoor Track and Field Championships.

[3] Representing the US in international competition, Lalang won the bronze medal in the 10,000 metres at the 2019 Pan American Games.