Edmond Fischer is a biochemist whose seminal research revealed the role and importance of reversible phosphorylation — the attachment and detachment of phosphate groups to cell proteins — in the regulation of many cellular processes and immune responses.
With his colleague Edwin Krebs, Edmond was the first to purify and detail an enzyme, protein kinase, involved in the phosphorylation process. In acknowledgment of their work in this field, the pair were joint recipients of the 1992 Nobel Prize in Physiology or Medicine.