LeadershipPassages (ISBN 0-7879-7427-7 ) is a book on impact of environment on the ability of people to transform into leaders.
Full name of the book is "Leadership Passages : The Personal and Professional Transitions That Make or Break a Leader ".
An excerpt that outlines the transition points can be found at http://www.darwinmag.com/read/feature/column.html?ArticleID=1141&action=print