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He joined Tachau and Vought in 1938 , serving as a junior draftsman and associate , being certified as an architect in 1940 , before leaving in 1941 to work for a year as a draftsman in Shreve , Lamb & Harmon .
 Tachau, Shreve , Lamb & Harmon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tachau, Shreve , Lamb & Harmon