<prompt> tafsiri zifuatazo kutoka kwa swahili hadi kiingereza.alikuwa mwanasheria wa marekani wa 64 mkuu kutoka januari 1961 hadi septemba 1964, akihudumia chini ya kaka yake rais john f. kennedy na mrithi wake, lyndon b. johnson.  <response>: he was previously the 64th u.s. attorney general from january 1961 to september 1964, serving under his older brother president john f. kennedy and his successor, president lyndon b. johnson. 