Question:
Who was the head of Hamburg in Sep, 2020?

Context:
 Ortwin Runde is the head of the government of Hamburg from Nov, 1997 to Oct, 2001. 
 Hans-Ulrich Klose is the head of the government of Hamburg from Nov, 1974 to May, 1981. 
 Kurt Sieveking is the head of the government of Hamburg from Dec, 1953 to Nov, 1957. 
 Max Brauer is the head of the government of Hamburg from Nov, 1946 to Dec, 1953. 
 Christoph Ahlhaus is the head of the government of Hamburg from Aug, 2010 to Mar, 2011. 
 Klaus von Dohnanyi is the head of the government of Hamburg from Jun, 1981 to Jun, 1988. 
 Herbert Weichmann is the head of the government of Hamburg from Jun, 1965 to Jun, 1971. 
 Peter Tschentscher is the head of the government of Hamburg from Mar, 2018 to Dec, 2022. 
 Paul Nevermann is the head of the government of Hamburg from Jan, 1961 to Jun, 1965. 
 Ole von Beust is the head of the government of Hamburg from Oct, 2001 to Aug, 2010. 
 Rudolf Petersen is the head of the government of Hamburg from May, 1945 to Nov, 1946. 
 Peter Schulz is the head of the government of Hamburg from Jun, 1971 to Nov, 1974. 
 Henning Voscherau is the head of the government of Hamburg from Jun, 1988 to Oct, 1997. 
 Carl Vincent Krogmann is the head of the government of Hamburg from Mar, 1933 to May, 1945. 
 Olaf Scholz is the head of the government of Hamburg from Mar, 2011 to Mar, 2018.

Answer:
Peter Tschentscher