it was a joint product with roy evans. i was 36 years old. it's the kind of book i couldn't write now. it's really a good book. an excellent book. >> why couldn't you write it now? >> i had over 200 interviews. roy and i had over 200 interviews and there's so much detail and so much work went into if. beyond the interviews in the book we reported those days so meticulously on everything. the book i would write now, i don't think i'll write any more biographies, if i did it would be much more impressionistic. this was detail. -- wrote in the book, robert carroll, in his biography of johnson, the senate majority leader, cites our book repeatedly in footnotes and in the text. he wrote a very nice autograph for me praising our book, which i quote. i was very proud of that. it's something every writer does that he's most proud of. that was that book. >> in writing with rolen evans, there's a lot of him in this room. what was that like? talk to writers today who collaborate and all of them have different stories on how the collaboration process wor