After receiving his doctorate in 1952, he remained at TU.  He continued his research on the organometallic chemistry of the transition metal. He almost immediately challenged the structure for ferrocene as postulated by Pauson and Keally. Shortly thereafter, he published the structural data of ferrocene and the new complexes nickelocene and  cobaltocene.  Near the same time, he focused also on the then baffling chemistry resulting from Hein's reactions of chromium(III) chloride with phenylmagnesium bromide.  This effort resulted in his isolation of bis(benzene)chromium, foretelling an entirely new class of sandwich complexes.