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From about 1930 , these short documentaries were almost exclusively written , produced and directed ( and occasionally edited and narrated ) by Ralph Staub , until the series was discontinued in 1958 .
 person: Ralph Staub
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Ralph Staub 
Answer:
 person: Ralph Staub