A talk with Herman Ilgen, who's been a negotiator for more than 30 years and who is the founder of the Institute for Nonverbal Strategy Analysis (INSA). Ilgen has researched how facial expression patterns may be connected to personality traits. His paper was titled "Personal Nonverbal Repertoires in facial displays and their relation to individual differences in social and emotional styles." Topics discussed include: what led him to do that work; what the findings were; how he makes practical use of those findings; and general thoughts on negotiation strategies. 

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