Funded by the US government's NSA and DARPA, Heck led a team at SRI International that was the first to successfully create large-scale deep neural network (DNN) deep learning technology in the field of speech processing. The DNN work was used to win the 1998 National Institute of Standards and Technology Speaker Recognition evaluation. From 1998 to 2005, he was Vice President of R&D at Nuance Communications. From 2005 to 2009, he was Vice President of Search & Advertising Sciences at Yahoo! where he co-founded the Yahoo! Labs organization. Later, he was the Chief Scientist of Speech Products at Microsoft where he and Zig Serafin (GM) established the vision, mission, and long-range plan for Microsoft’s digital-personal-assistant technology. This technology was eventually launched as the Cortana personal assistant.. In 2014, he joined Google as a Director of Research where he founded the deep learning-based conversational AI team "Deep Dialogue" responsible for advanced research behind the Google Assistant.

Larry Paul Heck is the CEO of Viv and Senior Vice President and Head of Bixby North America at Samsung. His career spans many of the sub-disciplines of Artificial Intelligence including speech and speaker recognition, natural language processing, dialogue systems, web search, online advertising and acoustics. He is probably best known for his role as the founder of the Microsoft Cortana Personal Assistant and his early work in deep learning for speech processing.