Sebastian Arcelus as Jay Whitman, Elizabeth 's current chief of staff and previous senior policy advisor (season 3 -- present; recurring season 1 -- 2). In season 3, it is revealed that Jay 's busy schedule working for the Secretary has strained his marriage. He is currently separated from his wife Abby, who maintains custody of their daughter Chloe. Jay is promoted to chief of staff in season 4.
what is jay's job on madam secretary
chief of staff and previous senior policy advisor