|Portrayed by||Kelli Williams|
|Family|| Alec Foster (ex-husband)|
Sophie (former adopted daughter)
|Affiliation||The Lightman Group|
Before the show began, Gillian and Alec adopted a baby, Sophie, who was eventually returned to the birth mother.
Gillian is the Lightman Group's resident psychologist.
Alec and Gillian had a loving relationship, even attempting to adopt a baby before the show's Pilot. It was shown several times on the show that he is lying to Gillian about something, and that Cal knows, much to Torres' dismay. However, it is shown that he is not unfaithful, as originally thought, and instead had relapsed back into doing drugs (cocaine).
- This character is based on Dr. Maureen O'Sullivan, a psychology professor at the University of San Francisco who helped Paul Ekman (on whom Cal Lightman is based) in the discovery of microexpressions and the creation of The Paul Ekman Group.
|Characters of the Lie to Me Series|