Who requires prior approval from the D.O.B in the event of an eminent health or safety hazard?

The correct choice is the Professional Engineer because this role involves specific knowledge and expertise in assessing and addressing complex issues related to health and safety hazards. When there is an imminent risk, such as a potential failure of a boiler or other critical system, the actions taken must be thorough and informed by engineering principles to ensure safety and compliance with regulations.

Professional Engineers are specifically trained to evaluate the implications of any changes and to devise practical solutions that adhere to building codes and standards. Moreover, prior approval from the Department of Buildings (D.O.B) is crucial as it ensures that any proposed actions are vetted by the appropriate regulatory body, mitigating risks associated with hazardous situations.

While the other roles, such as Licensed Plumbers, Head of Maintenance, and Facility Managers, all play significant roles in the operation and management of facilities, their scope does not typically encompass the same level of engineering analysis required when immediate safety concerns arise. They may address immediate issues, but comprehensive plans or modifications often necessitate the input and approval of a Professional Engineer.