Julian Fellowes writes whenever, wherever. He credits that ability to his days as an actor, when he was on the go far too much to have a set space for concentration.

I had to write in a trailer. I had to write in a hotel room. I had to write in some portacabin, he told HuffPost. I dont really have a fixed routine, like you might think, and Im rather pleased about that. It means I could work on an airplane or train or something without making a great difficulty of adjustment.

Thats worthy of a round of applause, as Fellowes has penned 25 projects, including the Oscar-winning screenplay for 2001s Gosford Park and 52 plot-scrumptious episodes of the Emmy-winning period drama Downton Abbey , which follows the aristocratic Crawley family and their servants in early 1900s England.

Fellowes recently wrote the film follow-up to the upstairs-downstairs life of Downton. The movie hit theaters nationwide Sept. 20 and earned $31 million at the box office beating Brad Pitts Ad Astra and Sylvester Stallones Rambo: Last Blood. It has already brought in over $72 million worldwide, a rare, exciting feat for a thought-to-be risky adaptation .

Those numbers come as a welcome surprise to Fellowes, who admitted that a positive reaction from the audience would lead him to consider a sequel.

Thats just the reality of the situation, he said. Not entirely the box office, but also a kind of buzz in the air.