She started her career in the late 1970s at the UK-based film production company Cucumber Studios which she founded with her partner - fellow director Rocky Morton.
And that same year their innovative TV commercial for the newly launched soft drink Quatro gained recognition at the British Television Advertising Awards.
In 1984, Jankel and Morton co-authored a book titled Creative Computer Graphics that detailed the history of the craft and essayed its future.
[12] Following D.O.A., Jankel and Morton directed the film Super Mario Bros., loosely based on the video game of the same name, starring Bob Hoskins, John Leguizamo and Dennis Hopper.
"[17] Jankel became a director of television commercials for clients, such as Sealy, Coca-Cola, Bud Light, AOL, Bacardi, Hallmark and Greenpeace, winning multiple advertising awards.
[18] - working with over 72 major musical artists including Paul Simon, Red Hot Chili Peppers, Dave Matthews, Norah Jones, Wynton Marsalis, John Mayer and Dr.
In 2011, Jankel directed the 52-minute 3D show "Live on Air" shown on Sky3D Atlantic and Sky Arts, featuring the band Elbow, in rehearsal and performing at the 02 centre.