Warren is a deputy editor of the open-access journal Science Advances.

[1] He has contributed to the theory of Quantum Coherence as well as nonlinear optical spectroscopy.

Warren began his career in the field of Magnetic Resonance, where his work contributed to the revised understanding of the interactions between widely separated spins.

[2] Warren would go on to exploit these "Intermolecular Multiple Quantum Coherences",[3] and this work helped lead to the development of new pulse sequences for magnetic resonance imaging with new types of contrast.

His work in nonlinear optics developed a range of optical methods which exploit laser pulse shaping to image molecular content, including tissue and paintings.