Dr. Cal Lightman (Tim Roth)Brilliant and clever, Dr. Cal Lightman (Tim Roth) is a psychologist who is the founder of the Lightman Group and recognized as the world's leading deception expert. He founded the Lightman Group with Dr. Gillian Foster and is the boss of Ria Torres and Eli Loker. Based in Arlington, Virginia, the Lightman Group assists local and federal authorities with ongoing criminal investigations. They are brought in when the regular investigative tactics aren't yielding results.Cal has the unique ability to know if people are telling the truth by studying their body language and facial expressions. He discovered micro expressions, the slightest, almost imperceptible movement a person might make to indicate whether he or she is lying or telling the truth. As he puts it, he doesn't have much faith in words since the average person tells three lies in ten minutes.People, particularly those in the law enforcement and the legal system, are often skeptical of Cal's ability. But he almost always proves that he is right. He is often called upon to lecture law enforcement officials on how to interrogate suspects.Cal has a somewhat mysterious background but it is known that he has assisted the military and the government on several occasions. He also hides an inner pain about what first lead him to study body language and facial expressions.He is divorced from his ex-wife, Zoe Landau, and the two share custody of their adolescent daughter Emily Lightman. Cal is extremely protective of his daughter and struggles a bit with the fact that she is growing up. Cal is very close to Dr. Gillian Foster and the two share a history that predates the formation of the Lightman Group. The two have vowed to not let their professional skills interfere with their personal lives.Background: Six years ago, Cal left the Deception Detection Program he founded for the Defense Department. Show less «