About

A strong foundation supports ambitious vision.

Denneen & Company is a growth strategy consulting firm founded on the belief that strategic growth leads to greatness.

In the early 90s, Mark Denneen recognized an opportunity to apply his general management and marketing background to consulting. While traditional consulting firms delivered extensive reports filled with research and analytics, often missing were pragmatic findings and practical approaches that only those who had held leadership positions within companies could help to identify. Mark founded Denneen & Company to help provide the kind of real, practical value that supports the most ambitious vision for what a company can achieve. In 1993, he began providing custom, strategic guidance that would become the foundation for Denneen & Company’s approach to growth strategy.

Curious about your business, confident in our expertise.

While Denneen’s professionals come from varied backgrounds, we all have deep industry experience. We’ve sat in the seats of our clients. We’ve managed businesses and brands. And we’ve successfully applied our backgrounds to our engagements, while continuing to learn and build even further experience via our varied client interactions. As a result, we can provide our clients with broad perspectives on today’s issues.

Valuing your expertise as much as our own, we want to know all you can tell us about your business, your competitors, and industry. Then we can work together to identify the additional insights you need to help power your growth.

Cultivating strong working relationships.

We’re proud of the strong relationships we’ve built with the people we interface with every day, as well as the businesses they work for. Our client base includes companies that have been with us since our start, and we enjoy an impressive repeat rate. We view these relationships as the greatest testament to our success.

Meet our team

Denneen attracts accomplished professionals who are passionate — both about helping clients envision growth on a grand scale and providing strategic, grounded approaches. Our senior practitioners work hands-on alongside our clients, aligning their knowledge and experience with each client’s needs and goals.

We’re always thinking about the best ways to help companies grow.

Mark Denneen
Chief Executive Officer

“We take great pride in having established highly collaborative, long-term relationships with clients built on a foundation of trust, value, and tangible results.”
Following leadership roles at Proctor & Gamble and Saatchi & Saatchi, Mark founded Denneen & Company in 1993. A graduate of Milton Academy, Mark received his A.B. from Harvard College and his M.B.A. from the Harvard Business School.

Frank Endom
Executive Vice President

“Deep analysis into how and where companies make money almost always uncovers surprising insights and opportunities.”
Frank joined Denneen & Company in 1994 after running his own political consulting practice in Atlanta, Georgia. He received his B.A. in Economics and English from Emory University, with additional concentrations in Political Science and History.

Liz Davis
Senior Consultant

“Seeing how deep insights and creative thinking can unleash big ideas that really speak to consumers and customers is not only great for business results, but it is also a lot of fun.”
Liz joined Denneen & Company in 2014 after 4 years of brand management at Procter & Gamble and a year at Ciao Bella Gelato. She holds an M.B.A. from the MIT Sloan School of Management and a B.S. in Mathematics and Economics from Georgetown University.

Niti Patel
Principal

“Growing businesses starts with understanding the consumer or customer. Companies that best serve consumer and customer needs are those that win.”
Niti joined Denneen in 2015 following 14 years of general management experience that spanned from the incubation of start-ups to leading billion-dollar brands at Kimberly Clark and P&G. She holds an M.B.A. in marketing and entrepreneurship from University of Texas and a B.B.A. in M.I.S. from University of Houston.

Phil Ryan
Principal

“It’s incredibly satisfying to synthesize research, input, and analysis to arrive at the few key insights that drive strategic choices and create a competitive advantage.”
Phil joined Denneen & Company in 2014 following 11 years of leading brands and businesses at Procter & Gamble. He holds an M.B.A. from the Tuck School of Business at Dartmouth, and a B.A. in Philosophy from Bates College.

Gael Guillou
Vice President

“ We strongly believe that tailored and co-created solutions with our clients is the optimum way to maximize internal buy-in and ultimately a project outcome.”
Gaël brings 15 years of consulting experience, including as a consultant for Bain & Company prior to co-founding Igneos, a European based boutique strategy consulting firm. Gael also spent 5 years working for Johnson & Johnson on various international assignments.
Gaël holds a MS in Mechanical Engineering from UTT in France, and an Executive MBA from ESCP Business School. He is also a regular visiting lecturer at University of Namur and ESCP Business School Exec-MBA program.

Our core beliefs.

Strategic growth leads to greatness.

When a company looks carefully at opportunities, applying a deep level of insight and awareness, it grows not only bigger, but better — ultimately achieving a level of greatness that most never reach.

Findings aren’t insights.

Findings are the product of internal and external research. Insights are the result of sophisticated synthesis and meaningful analysis of those findings, and, when leveraged strategically, can lead to those aha moments with the power to transform an organization.

Having vision and seeing it through.

We believe in helping companies envision a bigger, bolder future, and translating that vision into the daily choices and actions it takes to achieve it.

There are no great companies without great leaders.

At Denneen, we don’t set out to solve puzzles or fix problems. Instead, we’re driven by the desire to help leaders grow their companies. People who, given the right insights and partnership, can rise to new levels of performance in leading the companies they run.

Curiosity is as important as expertise.

What we learn about each client is as crucial to helping them reach their goals as the experience and insights we bring.

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Join our team.

If you share our beliefs, consider joining us. For more information, or to submit your resume for consideration, contact us at Recruiting@Denneen.com.