Dennis ONeil More about Dennis ONeil Dennis O'Neil is a leading Internet sales and marketing thinker and doer with 20 years of building industry experience. Dennis founded ONeil Interactive to realize a more perfect customer experience after nearly a decade of leadership with a national builder. Guiding builders through markets with high-ROI strategies, ONeil Interactive has grown into a creative website design and marketing software powerhouse. Dennis has authored two books and countless articles discussing his insights on how technology has impacted the sales and marketing processes and professions.