Course were taught in English. The courses information is available here.
http://service.ifam.uni-hannover.de/%7Ezheng/

TA for Mathematics for Engineers I, 2014 Winter
TA for Mathematics for Engineers II, 2014 Summer
TA for Mathematics for Engineers I, 2013 Winter
TA for Mathematics for Engineers II, 2013 Summer
Instructor for Global Analysis - Differential geometry, 2013 Summer
Instructor for Mathematics for Engineers I, 2012 Winter