Cynthia Littleton Business Editor Ari Wallach has made his living as a professional futurist for more than 20 years. What does that mean? “I work with really large organizations, mostly helping them think about tomorrow — the far-off tomorrows,” Wallach explains on the latest episode of Variety podcast “Strictly Business.” Wallach’s forward-looking intellect is on display in the new PBS docu series “A Brief History of the Future,” which premiered April 3 on PBS in the U.S. He hosts the series and is an executive producer with Kathryn Murdoch, Wendy Schmidt and DreamCrew, the production banner headed by hip hop superstar Drake.