You can read an article by Jack about how he created the series on the Writers' Guild website.
It’s been an amazing process. Joel Wilson (our brilliant producer), Judy Counihan, (our amazing exec) and I decided early on that the only way to really make it work was to get the casting done as soon as possible. Writing and casting at the same time we wouldn’t be limited in the choices we made by saying – well, the writers have written a script about a deaf man, a deaf man is what we need. We wanted to get the best actors we could possibly get and then build the show around them, and I think we’ve got them.