Penny Mosgrove has acquired the real estate arm of concierge service Quintessentially, of which she is the CEO. : Penny Mosgrove has acquired the real estate arm of concierge service Quintessentially, of which she is the CEO An award-winning businesswoman who grew up in the North East has completed the management buy-out of the real estate arm of luxury concierge company Quintessentially. Penny Mosgrove, a former pupil of Central Newcastle High School, has been CEO of Quintessentially Estates for the past seven years and has now completed a management buy-out with help from North East advisors.