The phrase "act as a representative of" is correct and usable in written English.
You can use it when describing someone who is representing a person, organization, or group in a specific capacity or role.
Example: "In this meeting, I will act as a representative of our company to discuss the new partnership opportunities."
Alternatives: "serve as a delegate for" or "function as an agent of".
He was directed into the community with that full authority and was given free rein to act as a representative of the church.
–If you had to act as a representative of the United States responding to one of the protests you researched, what would your official statement be?
In 1988, when Mikhail Gorbachev visited the US on a trip to improve Soviet-American relations, Trump offered him an invite to Trump Tower, where he could "act as a representative of the American people".
A Federal credit union may act as a representative of and enter into a contractual agreement with one or more credit unions or other organizations for the purpose of sharing, utilizing, renting, leasing, purchasing, selling, and/or joint ownership of fixed assets or engaging in activities and/or services which relate to the daily operations of credit unions.
Simultaneously the forum will act as a representative of the interests of disabled scientists and provide a system of assistance with regard to their scientific work and their professional careers.
The role is to act as a representative of your club for PFA and every side from the top of the Premier League to the bottom of League Two will have one.
Natural helpers are then trained to help others more effectively, with the aim of ensuring that a trained natural helper can act as a representative for each of the networks within a community.
It doesn't help that the individuals asked to represent and speak on behalf of us are often at the extreme end of the spectrum – although, finding anyone who can act as a representative for a group of people from wildly different experiences and backgrounds is always going to be tricky.
It's a serious step towards reforming the Lebanese economy," says Qassem Tlaiss, a resident of Brital who acts as a representative of the powerful Bekaa clans known to farm cannabis.
She had acted as a representative of the owner at the club, and in support of the board of directors, before formally joining the board of Chelsea FC plc in the summer of 2013.
