establish someone or something as someone or something
to validate or confirm someone or something as someone or something. As soon as we establish her as a viable candidate, we will launch the publicity campaign. She established herself as an authority on rare books.
establish someone or something in something
to set someone or something up in something or some place; to install someone or something in something or some place. We established a restaurant in the middle of downtown. My uncle established me in the candy business.