Adam Willis began his career at Coventry City as a trainee but after failing to make the grade was given a free transfer and joined Swindon Town in 1998 where he eventually made a total of 102 appearances and scored 3 goals.

During his time there he had a short loan spell at Mansfield.

He joined the Harriers in time for the start of the 2003-04 season but once Jan Molby returned to the club he fell out of favour. He was involved in a car crash in December 2003 and received a neck injury from which he never recovered and was released in May 2004.