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.[4]
