Theodore Bressman and David Branson Smith have come on to pen the script of Paramount and Montecito’s “Field Trip.”Jordan Cahan developed the original story, which follows a schoolteacher who takes his class on a time traveling field trip. Ivan Reitman and Tom Pollock will produce through Montecito Pictures along with Joe Medjuck and Gregory Lessans, who will produce through Walden Media. This has been a passion project of Reitman’s for some time, and he now has the writers he needs to move the project forward. As for Bressman and Branson Smith, their story shows that patience and working the assistant circuit can pay off. Bressman and Smith met while Bressman was an assistant for Mike White and Smith was working for Evan Goldberg and Seth Rogen. The WME and Principato/Young-repped duo had co-written a handful of specs that drew the attention of Reitman and Walden Media.