"act as supervisors" is correct and usable in written English.
It means to perform the duties and responsibilities of a supervisor. Example: The senior employees were asked to act as supervisors for the new trainees during their first week of work.
Our receptionists and many of the office staff are also volunteers, but we need paid staff to act as supervisors, managers and fund raisers.
Justice Anthony Kennedy's majority opinion in the case stated, "[t]o hold that invocations must be nonsectarian would force the legislatures that sponsor prayers and the courts that are asked to decide these cases to act as supervisors and censors of religious speech," meaning that prayers are allowed to be specific to a person's particular beliefs or traditions.
The academic staff at the departments act as supervisors for the theses.
GMcC and TC and will act as supervisors to HPF who is conducting this research in fulfillment of a PhD.
Differences in parental supervision or the possibility that older siblings sometimes act as supervisors may explain this association.
Township MCH workers on the other hand might act as supervisors to monitor and feedback on the performance of village doctors and to bridge care between the family, community and health facility.
SAA act as field supervisor and financial director and contributed to analysis and writing of the manuscript.
The Second Battalion is a small, elite start at independence -- only about 700 men, and they still work in close cooperation with American soldiers, who say they act more as advisers than as supervisors.
How could a man who in 1993 carried on a sexual relationship with Lowrita Rickenbacker, a convicted prostitute and drug dealer who'd been arrested multiple times in the very precinct where he acted as supervisor, become, in 2012, the top cop on a force of over 2,500 officers?
