Final answer:
Irene is engaged in the field of public relations, dealing with media to maintain a positive brand image and manage controversies, while also considering ethical aspects of communication.
Step-by-step explanation:
Irene, as a senior manager tasked with conducting press conferences and managing media relations to maintain a positive brand image, is most likely engaged in the field of public relations (PR). In this role, Irene needs to uphold the brand's reputation by dealing with controversies, disseminating positive news, and ensuring transparent communication with the public. Ethical considerations, like disclosing relationships in the case of paid ambassadors mentioned, play a crucial role in maintaining trust in PR practices, something Irene would need to manage carefully in the context of media homogenization and ensuring distinct messaging.