The phrase "acts in the capacity of" is correct and usable in written English.
It can be used to describe someone performing a specific role or function within an organization or situation.
Example: "She acts in the capacity of a project manager, overseeing the team's progress and ensuring deadlines are met."
Alternatives: "serves as" or "functions as".
Much of the success of the evening was due to the excellent management of Mr. Underhill who acted in the capacity of both pianist and conductor.
If any dealers are to act in the capacity of sub-underwriters and are to be allowed or paid any additional discounts or commissions for acting in such capacity, a general statement to that effect will suffice, without giving the additional amounts so paid or to be so paid.
Mr. Reider, who does not act in the capacity of a psychologist when he is attending meetings, described the first year after the breakup of a marriage as a "period of insanity". Many men, he said, do not know where to turn for help.
Thinking longer term, Amazon could act in the capacity of a PBM (either through acquisition or on its own) and establish direct relationships with branded manufacturers.
In addition to his mastery of the equine arts, the ringmaster also acted in the capacity of performance director.
When the police react to these encounters on a personal level, they are no longer able to act in the capacity of a professional.
She largely blamed the attacks on Gregg Housh, an early Anonymous member who often acted in the capacity of a spokesperson and now describes himself as an "observer" of the group.
The oxy-radical scavenger enzyme manganese superoxide dismutase (MnSOD) may act in the capacity of a tumour-suppressor gene.
One broker got an order to buy $10,000 in Liberty Bonds and in his letter transmitting them to his client pointed out that he had in no wise solicited the transaction, but had "acted therein solely in the capacity of broker in the execution of your order in the open market.
One broker got an order to buy $10,000 in Liberty Bonds and in his letter transmitting them to his client pointed out that he had in no wise solicited the transaction, but had "acted therein solely in the capacity of broker in the execution of your order in the open market.
