[1] Holliday became one of the first 100 employees of Tracor in 1962 and quickly became Director of Analysis and Applied Research in the Electronic Systems Division.
His study of transient flow in natural gas pipelines led to the publication of a textbook which is still used as a standard reference.
In the 1970s Holliday began testing a revolutionary technique for the detection and size measurement of zooplankton in thin layers involving multi-frequency backscattering.
The technique developed and after twenty years became the established framework for research in the field.
[2] Holliday was awarded the Prix d'Excellence by the International Council for the Exploration of the Sea (ICES) in recognition of extraordinary contributions, fulfilling the ICES vision of scientific discovery, leadership, and applications that have had major influence on policy for sustained use and conservation of marine ecosystems.