Yanis Varoufakis is a Greek economist, academic, and politician who served as the Minister of Finance in Greece from January to July 2015. He is known for his controversial role during the Greek government-debt crisis and his subsequent work as the co-founder of the Democracy in Europe Movement 2025 (DiEM25). Varoufakis has been vocal in his criticism of the European Union's handling of the Greek financial crisis.
Regarding Thomas Wieser, Varoufakis has disputed Wieser's claim that the Greek government under Varoufakis cost their economy 200 billion euros in 2015, calling it "ludicrous." Varoufakis has also accused Wieser of attacking him and DiEM25, and has highlighted the disagreements between them during the Greek financial crisis. Wieser, who was the president of the Eurogroup Working Group, has been a key figure in the discussions around Greece's financial situation.
For more detailed insights into their interactions and the broader context of the Greek financial crisis, you can refer to Varoufakis's official website and his book "Adults in the Room," which provides his perspective on the events. Source