Who played Mork in 'Mork & Mindy'?

In which TV series is Vinnie Barbarino a main character? Who played Jack Tripper in 'Three's Company'? Who played Chrissy Snow in 'Three's Company'? In which TV series is Chrissy Snow a main character? Who played Latka Gravas in 'Taxi'? In which TV series is Latka Gravas a main character? Who played Louie De Palma in 'Taxi'? In which TV series is Louie De Palma a main character?