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More current contributors include Otis Boykin , whose inventions included several novel methods for manufacturing electrical components that found use in applications such as guided missile systems and computers , and Colonel Frederick Gregory , who was not only the first black astronaut pilot but the person who redesigned the cockpits for the last three space shuttles .
 Otis Boykin, Frederick Gregory
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Otis Boykin, Frederick Gregory