She founded Ingpen and Williams in 1946 and for 15 years worked to establish a list that included the singers Hans Hotter, Geraint Evans and Joan Sutherland, and the conductors Rudolf Kempe and Georg Solti. When Solti became music director of Covent Garden in 1961, he asked Ingpen to dispose of her agency and join him at the opera house as controller of planning. After some thought, Ingpen accepted, Howard Hartog took over Ingpen and Williams (which is still flourishing today) and the new administrator began to make her mark almost immediately at Covent Garden.
And what has become of the Williams side of the agency, you may ask? Williams, dear readers, was her dog.