Withdrawal from opioids such as oxycodone causes physical symptoms similar to the flu. Withdrawal also causes psychological symptoms whose demoralizing affects can be just as overpowering as the physical symptoms of withdrawal.
A director is a person from a group of managers who leads or supervises a particular area of a company, program, or project. Companies that use this term often have many directors spread throughout different business functions or roles (e.g. director of human resources).
One or more of these might be a managing director. To a lesser extent, the shareholders are also in charge of a company-it is their invested funds which allow the company to function and they have an interest in how the company is run because the company needs to succeed for them to see a return on their investment.