In 1944, after the Soviet invasion of the Baltics, he left Lithuania with his parents, and in 1949 he moved to the United States, where he spent the rest of his youth.

After graduating, he served as the commander of the Rock Island Arsenal and was heavily involved in the development of controlled projectile and artillery weapon systems until 1985 when he moved to the United States Army Reserve.

In August 2006, politician Vytautas Pociūnas died under controversial circumstances, when he fell through the window of the hotel "Inturist" in Brest.

[4] A year later, Prime Minister Gediminas Kirkilas formed special work group to investigate the death circumstances repeatedly, which included Kronkaitis among others.

[6] In May 2007, the Union of Citizens penned an open letter on the matter, of which the signatories was Kronkaitis.