Ahmed Zewail

Early Life in Egypt

Ahmed Hassan Zewail was born on February 26, 1946, in Damanhur, Egypt, and spent much of his childhood in Disuq in the Nile Delta. His father worked for the government and also ran a business, while his mother devoted herself to the family. From an early age Zewail was strongly drawn to mathematics, mechanics and chemistry. In his bedroom he once built a small experimental apparatus from his mother's oil burner and glass tubes to investigate how wood could be transformed into gas and liquid — an experiment he later remembered partly because of the danger of setting the house on fire.

Zewail studied chemistry at Alexandria University, earning his bachelor's degree in 1967 and master's degree in 1969. After working there as a demonstrator and researcher, he obtained funding for graduate study at the University of Pennsylvania and moved to the United States in 1969.

The Journey to Caltech

Zewail earned his doctorate in chemical physics from the University of Pennsylvania in 1974, working with Robin Hochstrasser. He then completed an IBM postdoctoral fellowship at the University of California, Berkeley, where he worked with Charles Harris on molecular dynamics and laser spectroscopy. In 1976 he joined Caltech as an assistant professor. He became an associate professor in 1978 and a full professor in 1982.

At Caltech, Zewail pursued one of chemistry's most difficult problems: observing the extremely rapid changes that occur while chemical bonds break and form. These processes happen on the femtosecond timescale — million-billionths of a second — far too quickly for conventional methods of the time.

Inventing Femtochemistry

Zewail and his Caltech research group developed pump-probe techniques using ultrashort laser pulses. One pulse initiated a reaction and a second pulse probed the molecules after a precisely controlled delay, allowing researchers to follow molecular changes on the femtosecond timescale.

In 1987, Marcos Dantus, Mark J. Rosker and Ahmed Zewail published landmark work directly probing transition states during chemical reactions in real time. This programme of research established the field now known as femtochemistry and made it possible to study the motions involved as chemical bonds break and form. Zewail's leadership in this work ultimately earned him the 1999 Nobel Prize in Chemistry.

Nobel Prize and Global Influence

In 1999, Zewail was awarded the Nobel Prize in Chemistry, the sole recipient, for his studies of the transition states of chemical reactions using femtosecond spectroscopy. He was the first Egyptian and the first Arab to win a Nobel Prize in a scientific field, and he became a national hero in Egypt, where streets and schools were named after him. But he was not content to rest on his achievements. Zewail championed the creation of a major science and technology institution in Egypt. The concept was proposed in 1999 and its cornerstone was laid in 2000, but the project was delayed. After the 2011 Egyptian revolution, the government revived the initiative and established Zewail City of Science and Technology as the National Project for Scientific Renaissance, with Zewail becoming the first chair of its Board of Trustees. In 2009, he was also appointed to President Barack Obama's Council of Advisors on Science and Technology and was named as one of the first three U.S. Science Envoys. He believed that science was a universal language that could bridge cultures and build peace.

Legacy

Zewail died on August 2, 2016, in Pasadena, California, at the age of 70. He left behind a transformed field of chemistry, a research institute in Egypt, and a legacy as a scientist who bridged cultures and believed in the power of education. He authored some 600 articles and 14 books, and his research group included close to 150 graduate students, postdoctoral fellows and visiting associates. He also received dozens of honorary degrees and major international honours. He was a member of the National Academy of Sciences, the American Academy of Arts and Sciences, and numerous scientific academies around the world. His story — from a boy in the Nile Delta fascinated by mathematics, mechanics and chemistry to a Nobel laureate who helped scientists observe molecular change on the femtosecond timescale — is a testament to what curiosity and determination can achieve, regardless of where you start.