She was the producer of the BBC drama series Ashes to Ashes, and was an executive producer (alongside Steven Moffat and Piers Wenger) of the fifth and sixth series of Doctor Who (broadcast in 2010 and 2011).
Willis is the granddaughter of the late Ted Willis, Baron Willis. She was educated in Blackheath, at Blackheath High School and then in Dulwich, South London at the James Allen's Girls' School.
- "BBC Cymru Wales announces new Doctor Who producers". BBC Press Office (Press release). 15 April 2009. Retrieved 15 April 2009.