Dr. Thomas L. Sever is an archaeologist with NASA's Marshall Space Flight Center. Dr. Sever is NASA's only archaeologist and works primarily with Dan Irwin to decode remote sensing readings. While most of his work has dealt with South American and ancient Mayan civilization, Dr. Sever has also used his skills in meteorology. Remote sensing uses an apparatus that scans the earth with CAMS to detect features not seen by the human eye. While the sensitivity creates hundreds of readings and possibilities, specialists must analyze the data to determine the meanings.