Although philosophers have argued and discussed the possible universal basis of facial expressions of emotion for centuries, contemporary cross-cultural research on facial expressions of emotion stems from the writing of:

Paul Eckman

Explanation:

Although philosophers have argued and discussed the possible universal basis of facial expressions of emotion for centuries, contemporary cross-cultural research on facial expressions of emotion stems from the writing of Paul Eckman, he is a psychologist; a pioneer in the study of emotions and their relation to facial expressions who studies the relationship between emotions and facial expressions.

answer; the sons of liberty;

answer; procedural justice;