You're likely thinking of Robert Hill, a British biochemist famous for his groundbreaking work in photosynthesis. He is not to be confused with the astronomer Robert Hill, a contemporary.

Here's what you should know about Robert Hill (biochemist):

* Discovery of the Hill reaction: He discovered the first isolated step in photosynthesis, known as the Hill reaction. This reaction demonstrated that chloroplasts could produce oxygen in the presence of light and an artificial electron acceptor.

* Key role in understanding photosynthesis: His work laid the foundation for understanding how light energy is captured and used to drive the production of oxygen and energy-rich molecules.

* Pioneer of experimental techniques: Hill developed innovative experimental techniques for studying photosynthesis, including the use of isolated chloroplasts.

* Legacy and recognition: His work earned him significant recognition, including the prestigious Copley Medal from the Royal Society.

You can find more information about him by searching for "Robert Hill biochemist".