[2] He was born into a rowing family, with grandfather Hans-Johann Färber a double-Olympic medallist (gold in 1972 and bronze in 1976, both in the coxed four boat class).

[3] His grandfather trains his sister Marie (born 1999) who has won medals at 2016 and 2017 World Rowing Junior Championships.

[11] Less than a year later, Zeidler won the open men's 2000 m class in indoor rowing at the 2017 World Games in Wrocław, Poland.

In the A-final, he surprised by winning bronze in the open men's single scull, beaten by Czech incumbent world champion Ondřej Synek and the Swiss Roman Röösli.

[10] At the World Rowing Cup II race, the Czech and Swiss were not at the start and Zeidler again won bronze, this time beaten by the New Zealander Robbie Manson and the German champion Tim Ole Naske.

[17] In 2024, Zeidler kicked off the Olympic racing season with a win at the World Rowing Cup held in Varese, Italy, on 14 April.