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Prior to joining the HPRC , he worked for 6 years as a consultant at Tandem Netherlands BV where he specialised in the areas of large databases and performance . Among other posts at CDC , he served as director of the division of immunization from 1988 to May 1993 , when he was named director of the new National Immunization Program . And as he sought through the fierce battle 's press , either for Cygnus or for Hector , he met Cygnus and engaged at once with him ( Fate had preserved great Hector from such foe till ten years from that day ) . Although Fox is not an Africanist , he did a fine job of presenting the information in a form suitable for fourth - to ninth-graders . Returning to Ireland , he taught school for a time at Limerick .