 Earlier work focused on the emergent properties of complex systems such as ultrasensitivity (all-or-none switches) at critical junctures in the cell cycle.ResearchGate reports 54 peer-reviewed published works in a wide range of fields, including signal transduction, cell biology, molecular evolution, cell cycle, cognition and memory, meteorology, and pedagogy.Scopus notes an h-index of 30 and 4488 citations of 51 publications tracked in that database since 1996.