Rudolph A. Marcus is a theoretical chemist whose research has fundamentally altered the scientific community’s understanding of how electrons are transferred between molecules.

His "Marcus Theory" not only has implications for a wide array of fields, including biochemistry and electrochemistry, but also aids in the development of new technologies for solar energy and electronic devices.

His long career is distinguished by contributions that have continually shaped contemporary chemistry.

He was elected as member of the European Academy of Engineering in 2005.