Question:
Who was the head coach of the team Tennis Borussia Berlin in Jul, 1997?

Context:
 Dejan Raičković is the head coach of Tennis Borussia Berlin from Oct, 2005 to Sep, 2007. 
 Winfried Schäfer is the head coach of Tennis Borussia Berlin from Mar, 1999 to Jun, 2000. 
 Cemal Yıldız is the head coach of Tennis Borussia Berlin from Jan, 2017 to Sep, 2017. 
 Robert Jaspert is the head coach of Tennis Borussia Berlin from Nov, 2000 to Mar, 2001. 
 Thomas Brdarić is the head coach of Tennis Borussia Berlin from Sep, 2017 to Jun, 2018. 
 Mirko Slomka is the head coach of Tennis Borussia Berlin from Jul, 2000 to Nov, 2000. 
 Thomas Herbst is the head coach of Tennis Borussia Berlin from Jun, 2008 to Jun, 2010. 
 Hermann Gerland is the head coach of Tennis Borussia Berlin from Oct, 1996 to Nov, 1998. 
 Markus Schatte is the head coach of Tennis Borussia Berlin from Apr, 2011 to Apr, 2014. 
 Theo Gries is the head coach of Tennis Borussia Berlin from Jul, 2003 to Oct, 2005. 
 Stanislav Levý is the head coach of Tennis Borussia Berlin from Nov, 1998 to Mar, 1999.

Answer:
Hermann Gerland