While there , he helped manage distribution of the first micro-software program , Visicalc .
In 1979 , Dan Flystra recruited Esber to run worldwide sales and marketing for Person Software ( later renamed VisiCorp ) .
While there , Esber helped manage distribution of the first micro-software program , Visicalc .
In 1979 , Dan Flystra recruited Esber to run worldwide sales and marketing for Person Software ( later renamed VisiCorp ) .