Definitions of Alpha geek on the Web:

• The word geek is a slang term, noting individuals as "a peculiar or otherwise odd person, especially one who is perceived to be overly obsessed with one or more things including those of intellectuality, electronics, etc. ...
  en.wikipedia.org/wiki/Alpha_geek

• The most technically adept, knowledgeable person in a workgroup or office
  en.wiktionary.org/wiki/alpha_geek