She is president and CEO of Toronto-based Capri Films Inc., a vertically integrated production and distribution company that she founded in 2000.
Martinelli went on from there to work as head of production for the Toronto-based Independent Pictures, serving as associate producer on John and the Missus and co-producer of Milk and Honey.
Martinelli's producing credits also include Baz Luhrmann's Romeo + Juliet, David Cronenberg's Naked Lunch and M. Butterfly, Clive Barker's Nightbreed (including the documentary), Between Strangers, starring Sophia Loren and Pete Postlethwaite, and Journey to Enlightenment, based on the life of Dilgo Khyente Rinposhce, a revered teacher of the Dalai Lama with narration by Richard Gere and music supervision by Philip Glass.
For television, Martinelli produced the highly successful two-part, four-hour mini-series Lives of the Saints (inspired by the Nino Ricci novel), a co-production with the CTV Network in Canada and RTI in Italy, directed by Jerry Ciccoritti, and starring Sophia Loren, Sabrina Ferilli, Kris Kristofferson, Nick Mancuso, Jessica Paré and Fabrizio Filippo.
In 2003, Martinelli produced (in association with David and Ed Mirvish Productions) Scaramouche Jones, an award-winning one-man show starring Pete Postlethwaite.