By Calvin Hennick, Globe Correspondent

Kate Shane Middleton an event marketing associate at Vibram uses an exercise ball instead of a chair as she works at a desk.

Older generations sometimes find themselves annoyed with Generation Y’s sense of entitlement, said Rachel ­Reiser, assistant dean at Babson College in Wellesley and author of “Millennials on Board: The Impact of the Rising Generation on the Workplace.”

But young employees are already making positive contributions to their places of work, Reiser said. “The concern about hubris and entitlement is a valid one, and it’s also one that has become overblown. Millennials are really underappreciated in their interest in making an impact right out of the gate.”