Question:
Who was the chair of Academy of Arts of the GDR in Jun, 1959?

Context:
 Heinrich Mann is the chair of Academy of Arts of the GDR from Jan, 1950 to Jan, 1950. 
 Manfred Wekwerth is the chair of Academy of Arts of the GDR from Jan, 1982 to Jan, 1990. 
 Otto Nagel is the chair of Academy of Arts of the GDR from Jan, 1956 to Jan, 1962. 
 Johannes R. Becher is the chair of Academy of Arts of the GDR from Jan, 1953 to Jan, 1956. 
 Konrad Wolf is the chair of Academy of Arts of the GDR from Jan, 1965 to Jan, 1982. 
 Willi Bredel is the chair of Academy of Arts of the GDR from Jan, 1962 to Jan, 1964. 
 Heiner Müller is the chair of Academy of Arts of the GDR from Jan, 1990 to Jan, 1993. 
 Arnold Zweig is the chair of Academy of Arts of the GDR from Jan, 1950 to Jan, 1953.

Answer:
Otto Nagel