He made his Formula One debut in 2012, racing a McLaren MP4-27.
He began racing karts, and made his professional debut in 2008 in the Danish Formula Ford series.
In 2013 he was the Formula Renault 3.5 Series champion.
His father, Jan Magnussen, was a very successful Formula One racer.
He joined McLaren in Formula One full time in 2014 as a replacement for Sergio Perez.