. >> reporter: pete souza is the chief white house photographer.spaper photographer, hand picked by president barack obama to snapshots both political and plift. taking some 20,000 pictures every month. you've been quoted as saying you are the luckiest s.o.b.photographer in the world. why? >> i am. right now i'm focused on documenting this presidency for history. i'm not worried about tomorrow's newspaper or next week's magazine. i'm worried about creating a body of work that will last, you know, hopefully maybe 500 years. >> reporter: it is souza's second tour here. >> all right. let's go. >> reporter: he was an assistant photographer in the reagan white house who jump at the chance to document history once more. every one of his photos goes into the national archives for later release. the white house publishes 75 online each month month and a few make it on to the white house walls. here is the president playfully adding weight to one of his staffers. that is such a funny shot. >> you can't plan for something like this to happen. it just happens