OXFORD: A celebration was held at the Headington offices of market analysis firm AC Nielsen when Arthur C Nielsen junior, son of the company's founder, visited the site. Mr Nielsen, 87, who was himself both chairman and president of the business, officially opened the refurbished building, delighting employees with tales of the company's beginnings. Managing director Eleni Nicholas presented Mr Nielsen with Waterford Crystal and an original painting of the Oxford Radcliffe Camera, and later hosted afternoon tea, where Mr Nielsen spoke to some of the company's longest-serving employees, and most recent graduate recruits.