query: SELECT ?item WHERE
  {
  ?item wdt:P31 wd:Q5 .           #instance of: human
    ?item wdt:P27 wd:Q30 .          #country: USA
  
    {?item wdt:P106  wd:Q21281706 . } #occupation: acad admin
    UNION
    {?item wdt:P106  wd:Q5428874 . } #occupation: acad faculty
    UNION
    {?item wdt:P39 wd:Q1255921 ;
           wdt:P642 wd:Q3918. }  #position held
  }