In 1973, he graduated from Gdańsk University of Technology and received his PhD when he defended his doctoral dissertation in 1982, on the implementation of liquid chromatographs.

[2] Klawiter is a devout Roman Catholic and a member of the Knights of the Holy Sepulcher in Jerusalem.

[3] On 15 December 2012, he was elected the chairman of the board of the Right of the Republic of Poland in the Pomeranian Voivodeship.

[3] Klawiter is heavily against In vitro fertilisation and abortion due to his Catholic faith.

Nonetheless, Dorota Wójcik, president of the Polish chapter of the Freedom From Religion Foundation expressed discomfort of Klawiter's close connection to the Knights of the Holy Sepulcher in Jerusalem and their leader Edwin Frederick O'Brien.