Richard S. Lazarus

Richard S. Lazarus (March 3, 1922 – November 24, 2002) was a psychologist who began rising to prominence in the 1960s, when behaviorists like B. F. Skinner held sway over psychology and explanations for human behavior were often pared down to rudimentary motives like reward and punishment. A Review of General Psychology survey, published in 2002, ranked Lazarus as the 80th most cited psychologist of the 20th century.

Main contributions：
Emotion definition
Lazarus (1991) defines emotions according to 'core relational themes' which are intuitive summaries of the 'moral appraisals' (e.g. of relevance, goal conduciveness) involved in different emotions. These themes help define both the function and eliciting conditions of the emotion. They include:
Anger - a demeaning offense against me and mine.
Fear - facing an immediate, concrete, and overwhelming physical danger.
Sadness - having experienced an irrevocable loss.
Disgust - taking in or being too close to an indigestible object or idea (metaphorically speaking).
Happiness - making reasonable progress toward the realization of a goal.

Selected works by Richard S. Lazarus：
Adjustment and Personality, 1961
Personality and adjustment, 1963, Englewood Cliffs, N.J: Prentice-Hall.
The Nature of Psychological Inquiry, 1964
Psychological stress and the coping process, 1966, New York: McGraw-Hill.
Personality, 1971, (2nd edition) Englewood Cliffs, N.J: Prentice-Hall.
Patterns of adjustment and human effectiveness, 1968, New York: McGraw-Hill.
Patterns of adjustment, 1976, (3rd edition), New York: McGraw-Hill.

Reference
https://en.wikipedia.org/wiki/Richard_S._Lazarus