sentences:  In April 2017, Dow said that it was considering retaining Liveris beyond his planned retirement on 30 June 2017, to help oversee the planned merger between Dow and DuPont.In May, Dow said that Liveris would retire from the DowDuPont company mid-2018, serving as executive chairman until between April and July 2018.He stepped down from his executive positions at DowDuPont on 1 April 2018, remaining a director.