Philip Slater was an author, actor, playwright, and sociologist. He taught sociology at Harvard, Brandeis, and the University of California at Santa Cruz. He obtained a doctorate from Harvard.
This is one of those books in the analysis of groups which attempts to give framework for categorizing the various behaviors observed in groups which are established for the purposes of studying group behavior.
I read this book in 1974, and was impressed with how much had been crammed into such a thin volume. Over the years, working in many groups, I have found that actual working groups do exhibit these behaviors, but the work takes the major focus when the group is work oriented. When the "work" is the study of the group, these behaviors are simply more pronounced.
It is still an interesting methodology, and his taxonomy does have some value.