The phrase "acted as assistant" is correct and usable in written English.
It can be used to describe someone who performed the role or duties of an assistant in a particular context or situation.
Example: "During the project, she acted as assistant to the lead researcher, helping with data collection and analysis."
Alternatives: "served as assistant" or "functioned as assistant".
He returned home at 19, and acted as assistant trainer to his father until the latter's sudden death in 1943.
Loyally, he played for Mohun Bagan, or coached for it, or acted as assistant secretary and general sounding board, for five decades.
Educated at St. Edmund Hall, Oxford, Hearne acted as assistant librarian of Oxford's Bodleian Library between 1699 and 1715 and did much to index and catalog its acquisitions.
In 1960 Schorske moved to a professorship at the University of California at Berkeley, where he acted as assistant to the chancellor on faculty development.
From 1974 for eight years she acted as assistant director of the new opera centre in Athens, working with her great friend Christos Lambrakis.
The finance minister, Mathias Cormann, has acted as assistant treasurer with the prime minister saying he will make a decision on the future of Sinodinos after Icac delivers its findings.
The same charges were also dismissed against two women who reportedly acted as assistants during the procedure and the four mothers who prosecutors say brought their daughters to Nagarwala.
She currently acts as Assistant Professor in the English Language and Literature Academic Group at the National Institute of Education, in Singapore.
My teachers told me that as Good Friday approaches the children of the family often act as assistant peelers and soakers and washers and choppers.
Gillian Lloyd acts as assistant to Event Director, Mervyn White and his wife, Hazel who gives all-year-round support.
"In the meantime, current team captain Martin Canning will assume the player-coach role and take charge of first-team duties in the interim period, with Frankie McAvoy continuing to act as assistant for the time being.
