Dr. Julien's primary areas of research are in the dynamics and instability processes in geophysical and astrophysical fluid dynamics. These include turbulent fluid convection and the effects of stratification, rotation and magnetic fields which are all ubiquitous features of geophysical and astrophysical fluid objects. Particular emphasis has been placed on the development of reduced pde models from the fundamental fluid equations. Further focus has been placed on the characteristics of coherent structures and their transport and organization of large-scale flows. Integral parts of Julien's research include high perfomrance computer simulations, dynamical systems theory, asymptotics and perturbation techniques in applied mathematics.