He worked for the United States Geological Survey (USGS), Mineral Deposits Branch, in Colorado and Arizona from 1947 to 1954 (field seasons only), where he attained the status of Assistant Geologist.

[3] His main research interests were petrology, tectonics, and applications of geology and isotope geochemistry to geochronology, crustal evolution, ore deposits, and comparative planetology.

[3] While pursuing these research interests, Silver also played a major role in the Apollo Program's lunar geological exploration as well as on numerous national scientific advisory boards and committees.

[4] In the series' Episode 10 "Galileo Was Right," Silver is shown teaching the Apollo 15 astronauts field geology, and participating from Houston's Mission Control in their lunar extra-vehicular activities (Moonwalks).

For his significant scientific achievements in the development of highly precise isotopic compositions of uranium and lead in minerals and the applications of the age determination procedures in the analyses of lunar material.

While diligently conducting these laboratory investigations of lunar material, he provided a major contribution by training the astronauts in geological sciences which, through his enthusiasm, leadership and guidance, has led to the successful exploration of the moon.