Professional summary

I help companies win more business through more effective selling skills, proposals and grants.

I have a thirty plus-year career in talent development characterized by entrepreneurial business development, leadership, innovation and partnering with clients to achieve their business results. My specific expertise includes:
• Business development
Proposal development
• Leadership development
• Sales training
• Instructional design
• Team Development
I published the book Consultative Selling Skills and more than 80 articles on sales and leadership. My doctoral dissertation at the University of Rochester tested the effectiveness of an innovative approach to interpersonal skill development. The model became the framework for a

Engagement overview

Sales assessments, customized sales training and follow up sales coaching


• Sodexo
• the Economist
• Merrill Lynch
• Volvo, Gannett
• Volkswagen
• Kodak
• the Prudential


John Brennan has a very broad range of experience. He's helped me become more focused. Working with John as a coach/mentor, strategic advisor and sounding board was incredibly gratifying.


John Brennan has a relatively quiet but engaging presentation style. This is backed up by a highly incisive understanding of both the people and the subject, so he was able to help each person in the group gain from the course.

The follow up work that I did with John Brennan was truly life changing (for the better). John was able to get to the root of an issue that had held me back in both my professional & personal life. He showed great listening, understanding, empathy, analytical ability and coaching. This has left me with a far greater understanding of my own motivation and had a striking effect on my effectiveness at work and at home. This had been noted by my colleagues and family. In my view he has a very rare ability to communicate, listen, understand and resolve issues. I would wholeheartedly recommend him

Global Pharmaceutical Company

I would highly recommend the services of John Brennan and Interpersonal Development. The information he has provided is invaluable

Small Manufacturer

John is an elder statesmen figure. He is equally adept at handling a senior manager and a new graduate hire. John's knowledge and pedagogic expertise make him a first choice supplier when the need arises. I would not hesitate in recommending John to teach diverse groups or mixed hierarchies equally well as his style is both engaging and challenging in areas that most people already consider themselves experts but rarely are. Raising a learner's awareness is the first step in enabling change and John does this with finesse and ease without raising their defenses

Global Financial Services Company

I am predicting a significant increase in our customer satisfaction index when the last quarter sales are surveyed, and when that happens, I will be attributing much of the improvement to our relationship with Interpersonal Development

Automotive manufacturer