Question:
Who was the chair of Leibniz Association in May, 2013?

Context:
 Ernst Theodor Rietschel is the chair of Leibniz Association from Jan, 2005 to Jan, 2010. 
 Hans-Olaf Henkel is the chair of Leibniz Association from Jan, 2001 to Jan, 2005. 
 Matthias Kleiner is the chair of Leibniz Association from Jul, 2014 to Jun, 2022. 
 Ingolf Volker Hertel is the chair of Leibniz Association from Jan, 1995 to Jan, 1998. 
 Frank Pobell is the chair of Leibniz Association from Jan, 1998 to Jan, 2001. 
 Martina Brockmeier is the chair of Leibniz Association from Jul, 2022 to Dec, 2022. 
 Karl Ulrich Mayer is the chair of Leibniz Association from Jul, 2010 to Jun, 2014.

Answer:
Question:
Who was the chair of Leibniz Association in May, 2013?

Context:
 Ernst Theodor Rietschel is the chair of Leibniz Association from Jan, 2005 to Jan, 2010. 
 Hans-Olaf Henkel is the chair of Leibniz Association from Jan, 2001 to Jan, 2005. 
 Matthias Kleiner is the chair of Leibniz Association from Jul, 2014 to Jun, 2022. 
 Ingolf Volker Hertel is the chair of Leibniz Association from Jan, 1995 to Jan, 1998. 
 Frank Pobell is the chair of Leibniz Association from Jan, 1998 to Jan, 2001. 
 Martina Brockmeier is the chair of Leibniz Association from Jul, 2022 to Dec, 2022. 
 Karl Ulrich Mayer is the chair of Leibniz Association from Jul, 2010 to Jun, 2014.

Answer:
user
Karl Ulrich Mayer
assistant
Question:
Who was the chair of Leibniz Association in May, 2013?

Context:
 Ernst Theodor Rietschel is the chair of Leibniz Association from Jan, 2005 to Jan, 2010. 
 Hans-Olaf Henkel is the chair of Leibniz Association from Jan, 2001 to Jan, 2005. 
 Matthias Kleiner is the chair of Leibniz Association from Jul, 2014 to Jun, 2022. 
 Ingolf Volker Hertel is the chair of Leibniz Association from Jan, 1995 to Jan, 1998. 
 Frank Pobell is the chair of Leibniz Association from Jan, 1998 to Jan, 2001. 
 Martina Brockmeier is the chair of Leibniz Association from Jul, 2022 to Dec, 2022. 
 Karl Ulrich Mayer is the chair of Leibniz Association from Jul, 2010 to Jun, 2014.

Answer:
user
Hans-Olaf Henkel
Frank Pobell
Martina Brockmeier
Ernst Theodor Rietschel
Ingolf Volker Hertel
Matthias Kleiner
assistant
Question:
Who was the chair of Leibniz Association in May, 2013?

Context:
 Ernst Theodor Rietschel is the chair of Leibniz Association from Jan, 2005 to Jan, 2010. 
 Hans-Olaf Henkel is the chair of Leibniz Association from Jan, 2001 to Jan, 2005. 
 Matthias Kleiner is the chair of Leibniz Association from Jul, 2014 to Jun, 2022. 
 Ingolf Volker Hertel is the chair of Leibniz Association from Jan, 1995 to Jan, 1998. 
 Frank Pobell is the chair of Leibniz Association from Jan, 1998 to Jan, 2001. 
 Martina Brockmeier is the chair of Leibniz Association from Jul, 2022 to Dec, 2022. 
 Karl Ulrich Mayer is the chair of Leibniz Association from Jul, 2010 to Jun, 2014.

Answer:
user
Karl Ulrich Mayer
assistant