Allison Williams

Allison Williams was Rachel Jensen's assistant during 1963's Shoreditch Incident. She first appeared on site with Rachel Jensen, when a Dalek killed a few soldiers, and she witnessed the Doctor blow up the Dalek. Then she went with them all, and this lead up to events, where she helped the Doctor defeat the Daleks. (DW: Remembrance of the Daleks)

According to one account, in 1986 Professor Allison Williams led the scientific team which investigated the Cyberman ship in Antarctica. (DWN: The Power of the Daleks)