Before, prior to. There is no difference between these two except length and a certain affectedness on the part of 'prior to.' To paraphrase Bernstein, if you would use 'posterior to' instead of 'after,' then by all means use 'prior to' instead of 'before.
Bill BrysonThe food is excellent. The beer is cold. The sun nearly always shines. There is coffee on every corner. Life doesnโt get much better than this.
Bill BrysonEvery twenty minutes on the Appalachian Trail, Katz and I walked farther than the average American walks in a week. For 93 percent of all trips outside the home, for whatever distance or whatever purpose, Americans now get in a car. On average the total walking of an American these days - that's walking of all types: from car to office, from office to car, around the supermarket and shopping malls - adds up to 1.4 miles a week, barely 350 yards a day.
Bill BrysonAn awful lot of England is slowly eroding, in ways that I find really distressing, and an awful lot of it is the hedgerows... We're reaching the point where a lot of the English countryside looks just like Iowa - just kind of open space.
Bill Bryson