Zalis co-founded and wrote the code for QPID, which stands for Queriable Patient Inference Dossier, a natural languagesearch tool that extracts relevant clinical information from an EHR.
Powerset, the search engine that Pell created in 2003 and plans to open to the public in 2008, is one of a new crop of "semantic search" start-ups that aim to introduce natural language to the process of finding information on the Web.