The phrase "acted as expert" is correct and usable in written English.
It can be used when describing someone who performed the role or function of an expert in a particular situation or context.
Example: "During the project, she acted as expert in data analysis, providing valuable insights to the team."
Alternatives: "served as an expert" or "functioned as an expert".
Where were Geoffrey Boycott and Vic Marks, who had acted as "expert summarisers" during the Test matches?
Moreover, of the five pulmonologists who will still be allowed to examine X-rays when state claims are filed, three have acted as expert witnesses on behalf of coal companies or their insurers as they sought to challenge miners' benefit claims, as was reported by NPR in March.
HD acted as expert pathologist in analysing and interpreting analysis.
GW and AKB acted as expert consultants at all stages of study design and data analysis.
Dr. Ollson and Dr. Knopper have acted as expert witnesses for wind power companies during a number of legal hearings.
GCH acted as expert pathologist in gathering and interpreting pathology data, and revised and gave final approval of the manuscript.
8 Testimony Under Scrutiny Medical societies are setting up tribunals to review the testimony of doctors who act as expert witnesses in lawsuits.
Kirley and McMahon are suggesting there's a need for "digital speech experts" who could act as expert witnesses in the court room.
Some actuaries act as expert witnesses by applying their analysis in court trials to estimate the economic value of losses such as lost profits or lost wages.
During the "dialogue", stakeholders acted as experts too; that is, they suggested some integrations to the proposed framework: in particular they asked for the explicit consideration of the issue of density14 and a greater articulation of the dimension of economic sustainability.
Nodes have to act as expert systems and make suitable forwarding decisions based on local knowledge on the fly.
