Kieran initially trained as a mechanical engineer in Ireland, working both there and in New York. He completed a degree in mathematics at Lehman College, City University of New York. He worked as research assistant in oceanography at Oregon State University before completing an MS in oceanography there. Kieran worked as oceanographer at the Naval Oceanographic Office, performing tasks on various aspects of operational and predictive oceanography, including ocean forecasting and model development, data analysis, ocean observations, etc. For the PhD, he developed a regional model of the Indonesian seas circulation based on the POM which he defended at The University of Southern Mississippi. At the University of Hamburg, Kieran developed models for studying the impacts of pollution on ocean systems, including organic pollutants and climate change. He continued this work at Queens University Belfast, where he developed and presented numerous undergraduate and graduate courses and modules. STEM NI Ambassador.