He retired in 2004 as professor and director of the institute of water quality control and waste management at the technical university of munich , and has since served as director of the institute of advanced studies on sustainability Professor wilderer在2004年退休时,获德国慕尼黑大技术大学委任为水质控制及污水管理研究所所长,并出任该校可持续发展高级研究所所长。