Catherine Fox

Catherine Avery (née Fox) is a brilliant urologist who comes to Seattle Grace Mercy West to collect surgeons to "step into the future" and help her perform the first penile transplant surgery. She is also the mother of Jackson Avery and loves to meddle in his life.

Penile Transplant at Seattle Grace Mercy West Hospital
Catherine Avery first appears in season 8, episode 5 "Love, Loss and Legacy" where she performs a penile transplant with the assistance of Mark Sloan, Jackson Avery, Meredith Grey, and April Kepner.

Jackson Avery
Jackson Avery is her son. He gets irritated easily because she buts into his personal life.

Richard Webber
In Season 8, episodes 21 and 22, Catherine is shown to be a proctor at the Boards exams. Her pressence seems to affect Jackson's concentration although in the end he still passes his boards. She and Richard Webber begin a sexual relationship during this time.

They continue to develop this relationship into Season 9 and seems to make Richard genuinely happy.

Career
Catherine is a urologist and she also is in a position of power in the Harper Avery Foundation.