Background
He was born in Berlin, German Empire and died in Bonn, West Germany.
He was born in Berlin, German Empire and died in Bonn, West Germany.
In 1928 he participated with the German ice hockey team, in the Olympic ice hockey tournament. He played all six matches and scored one goal. In the 1933 World Ice Hockey Championships he scored two goals in a round robin match against Poland in Group Bachelor of the European tournament draw.
In the 1935 World Ice Hockey Championships in Davos, Switzerland he scored two goals against Poland in the ninth place game of the tournament.
At the 1936 Olympic ice hockey tournament he played all six matches and scored three goals. His teammate Rudi Ball was half-Jewish, and thus was initially overlooked for selection in the German ice hockey team
Jaenecke, his good friend refused to play unless Ball was included. With much controversy Ball was finally included in the German team to play at the 1936 Olympic games.
He was inducted into the International Ice Hockey Federation Hall of Fame in 1998.
In 1931 he was ranked third on the German tennis rankings after reaching the final of the German Championships that year where he bowed to Roderich Menzel. Jaenecke played for Germany in the International Lawn Challenge ties against Italy (in the 1932 Europe Zone final), Japan and Egypt. In 1935 he was a runner-up for the national title again that time losing it to Gottfried von Cramm.