In 2010, Pürner received his doctorate from the medical faculty of the Ludwig Maximilian University of Munich.

He lost this position in autumn 2020 after he publicly spoke out against the strategy of the Bavarian state government during the COVID-19 pandemic.

[2] In 2023, he successfully sued against an assessment that plays an important role in filling positions.

[4] On 6 February 2025, he decided to quit the BSW, citing a culture of "mistrust and surveillance" in the party as a reason for his unease.

He also criticized the Bavarian curfew and quarantine for entire school classes.