Webb studies solar coronal mass ejections (CMEs) and transient disturbances in the interplanetary medium and their effects on the Earth. His research has included studies of the structure and evolution of active regions, coronal transients, preflare and flare activity, the evolution of coronal holes, X-ray bright point loop structures, and X-ray and microwave observations of active region loops. He is currently co-Coordinator of the STEREO Space Weather group, and is the International Astronomical Union's Representative for the International Space Weather Initiative (ISWI). He is an author or coauthor on over 160 scientific papers and review articles, and is a frequent referee for scientific journals and reviewer for NASA and NSF proposals. He has given many invited talks and participated in many workshops and other domestic and international scientific meetings.