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Geoffrey 's acting career was overshadowed by his involvement in theatrical production and thanks to Barrie Stacey he ' cut his teeth ' booking many well known acts of the 1970s and 80 's , such as Frankie Vaughan , Semprini , The Bachelors , Frankie Howerd , Bob Monkhouse and Don MacLean .
 Geoffrey, Semprini
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Geoffrey, Semprini