Jeremiah P. Ostriker has been an influential researcher in one of the most exciting areas of modern science, theoretical astrophysics, with current primary work in the area of cosmology, particularly the aspects that can be approached best by large scale numerical calculations.

Ostriker has investigated many areas of research, including the structure and oscillations of rotating stars, the stability of galaxies, the evolution of globular clusters and other star systems, pulsars, X-ray binary stars, the dynamics of clusters of galaxies, gravitational lensing, astrophysical blast waves, active galactic nuclei, the cosmic web, and galaxy formation. 

Most significantly, Ostriker's research focused on the theories of : 

• Dark Matter and Dark Energy 
• The Warm-Hot Intergalactic Medium (WHIM)
• Galaxy Formation and black hole growth
• Interaction between Quasars and their surroundings

Ostriker has supervised and collaborated with many young researchers and graduate students. He is the author or co-author of more than 500 scientific publications.