Kaiser’s mom left him when he was a baby once she became a successful actress. He was born on Christmas day and grew up in the slums in Berlin, Germany. His father fell off of his director career and they lived in poverty. His dad was a drunkard and would constantly beat him and forced him to steal to survive. He was called worthless and a good for nothing, which he grew to believe. He saved up enough for a soccer ball on his 12th birthday and instantly developed a connection to it. 