Korcz arrived in Gorzów Wielkopolski in 1947 along with the first settlers. Initially, he worked at the Social House, later at the State Consortium of Business Schools (today's School of Economics).
With his artistic and didactic skills, he used to teach young painters and other artistic techniques. Although the reviews were quite strict, he gained a lot of sympathy for many young artists. This was the informal Academy of John, attended by such personalities as Wiktor Czyżewski, Roman Picinski, Juliusz Piechocki, Jerzy W. Michalski (under the pseudonym Jerry W. Mich) and Grzegorz Romanczenko. His close relationships with students can be observed on the basis of statements by such people as Grzegorz Romanczenko, who emphasized that Korcz taught heartily, selflessly because he believed in young people.
He was a member of the Association of Polish Artists, his first distinction was the award for showing his works at the exhibition of artists in Lubuskie in 1948. His passion was painting of landscapes, his works can be found in the Jan Dekert's Museum of Lubuskie, but many of his works are in collections of private people in which he stopped. The reason was housing problems, because it was only after some time since the arrival to Gorzów received a student from the office on ul. Sikorskiego, it turned out to be too tight for the studio and the place to store the work, so he moved to the apartment at ul. Woolen Market.
He belonged to the informal group Table Number 1. His biggest exhibition was the exhibition of paintings on the occasion of the 50th anniversary of creative work in 1977. He also received prizes such as the Lubuska Cultural Award, the "Nadodrza" Award and the Gorzow Society Culture Award.
He died on March 16, 1984. He was buried in the Poole Pointe in the municipal cemetery. On 17 July 1997 in the Avenue of Stars on the Old Market sheltered his plaques. In February 2010, a monument was dedicated to two Gorzów painters: Ernest Henseler and Jan Korcz.