Study of metals containing interstitials has been aided greatly using internal friction techniques. After methods had been developed for the heavy interstitials C, N and O in such metals as iron, niobium and tantalum, applications were extended to the light interstitial, H, in these same metals. The career of Otto Buck and his many collaborators spanned this last endeavor. Using important papers from his career, significant features of our understanding of alloys of metals with hydrogen are described.