My law school also gives off the first day of RH and YK and erev YK after 3.
The only info that you need to have is that it is 100% illegal to discriminate against you because of the Jewish holidays.
However, on a side note, someone who takes off (for example) Isru Chag Pesach when the company is in the middle of an important project is being a jerk and deserves to be fired (according to an article I read on erev Shabbos in the 5 Towns Jewish Times).
Ditto for a person who says he can’t work on Chanukah.