Apache cTAKES™ is a natural language processing system for extraction of information from electronic medical record clinical free-text. The development of cTAKES started in 2006 by a team of physicians, computer scientists and software engineers at the Mayo Clinic. The development team was led by Dr. Guergana Savova & Dr. Christopher Chute. cTAKES is released open source under an Apache v2.0 license. This system was deployed at Mayo and is currently an integral part of their clinical data management infrastructure and has processed in excess of 80 million clinical notes.