The series cultural influence goes far beyond its longevity and profitability. An entire subculture grew up around the series and, anecdotally, there are indications that "Star Trek" has influenced many people's lives. Many scientists and engineers claim that their professional and life choices were influenced by "Star Trek". An article in "Columbia" asserted that the starship captains of the "Star Trek" franchise are consistently among the best father figures on television, inspiring real fathers to embrace their responsibilities and act with "selfless authority". The inventor of the first non-vehicular cell phone, Martin Cooper, states he was motivated to develop it from watching "Star Trek". Others have also been inspired by "Star Trek" when designing new technology, such as Dr. Peter Jansen, who invented a functional tricorder, and several computer scientists at the University of Illinois, who have created a prototypical version of "Star Trek"s famous Holodeck.