Thomas Greenfield (or Greenfeild) of Witton Hall was the eldest son of Thomas and Lettice Greenfield and brother of Christopher, the Preston MP. In 1674 he married Martha Johnson of Manchester, with whom he had a daughter, also Martha, who inherited his estate after his death in 1716. Greenfield was a governor of Blackburn Grammar School for much of his life. 
Greenfield appears to have been a lawyer: a Thomas Greenfeild is described as ‘one of the Attorneys of his Majestys Court of Common Pleas at Lancaster’ on a Preston sacrament certificate of 1673.  He kept a town house on the north side of Fishergate and was sometimes known as ‘of Preston’. He appears in the Bellingham-Rawstorne diaries.