I think you mean Carol Gilligan. In any case, as critics of Tannen and Gilligan have pointed out, what they call "gender differences" in communication are in fact the differences in communication styles among any groups that differ in prestige and power. The high prestige group members interrupt more, speak more, direct the conversation, etc. The research on women in supervisory positions reinforces this perspective: Tannen's and Gilligan's claims about "women's communication styles" notwithstanding, women in positions of legitimate authority tend to use the "male", dominating verbal and nonverbal communication patterns when they interact with subordinates. Similarly, men in subordinate positions tend to use the "female", relational patterns of communication when they interact with their supervisors. Thus there are no essential "gender differences" here, just a reflection of power differentials in a given social context.
Miles