The decades-long relationship between Kathleen Hartnett, the co-head of issues & appeals practice Cooley, and her pro bono client Nakia Roy has gone from attorney-client to friendship and back again as Hartnett has moved in-and-out of government service. Hartnett told me yesterday it goes back so far that she can no longer access some of her first correspondence with Roy: They're in WordPerfect files.