"Jack Smith, the federal prosecutor leading highly sensitive investigations into Donald Trump, is a seasoned American lawyer who has led Kosovo war crimes probes in The Hague.
In November 2022, shortly after Trump announced another White House bid, US Attorney General Merrick Garland tapped Smith to oversee two independent investigations into the former president, saying that he had "built a reputation as an impartial and determined prosecutor.""
https://news.yahoo.com/trump-probe-prosecutor-veteran-corruption-210854149.html
"Jack Smith, the experienced war crimes prosecutor who unveiled an unprecedented federal indictment against former US president Donald J Trump on Friday 9 June, is no stranger to high-profile probes of public figures."
https://www.independent.co.uk/news/world/americas/us-politics/who-is-jack-smith-trump-prosecutor-b2228421.html
U.S. Justice Dept. names war crimes expert as special counsel for Trump probes
https://www.reuters.com/world/us/us-justice-department-appoints-special-prosecutor-trump-probes-2022-11-18/