Back to the Future was written by Bob Gale and Bob Zemeckis.
From Bob Gale: "I love it, are you kidding me?," Gale says. "It's amazing enough to have a hit movie, ever, in . To have one that has stood the test of time the way Back to the Future seems to have is absolutely amazing. And it's so gratifying. Everybody loves the story of someone who has a passion project that nobody wants to make, and everybody's still talking about it decades later."
Back to the Future received over 40 rejections before it was made, but Gale also says, "We'd never get anywhere with it today. We had a hard enough time getting Back to the Future made when we did. The thing that really got the movie made was that Bob Zemeckis had a hit film with Romancing the Stone, and then people were ready to be in business with him and make a movie he wanted to make. In the early days when we wrote , Steven Spielberg liked it, and (producer and former head of Fox) Joe Roth liked it. Everybody else didn't get it. The mix of genres we had in there, which is one of the things that makes the movie great, would be even harder to do today. Everybody wants things that fit into certain pigeonholes."