Question:
Which employer did Simon Streatfeild work for in Sep, 1960?

Context:
 Simon Streatfeild works for Regina Symphony Orchestra from Jan, 1981 to Jan, 1984. 
 Simon Streatfeild works for Academy of St Martin in the Fields from Jan, 1958 to Jan, 1965. 
 Simon Streatfeild works for London Symphony Orchestra from Jan, 1953 to Jan, 1955.

Answer:
Academy of St Martin in the Fields