Jim Collins
Essential idea: get disciplined people to act in a disciplined manner to create a disciplined culture.
High spot: re-establishing the value of hard-data for management argumentation
Low spot: ignoring the sheer 'ooomph' factor of great leadership
Key thought: 'good to great'
Key book: Good to Great
Wikipedia:'Jim Collins is considered to be one of the major American business gurus, who is like "a student of and a teacher for" great companies'
Overall positioning: quiet, professorial approach