Final answer:
Francis Bacon is the English thinker who championed empirical methods involving repeated observation and experimentation, contributing to the development of the scientific method.
Step-by-step explanation:
The English thinker who promoted repeated observation and experimentation is Francis Bacon. He is often credited with developing the empirical method and laying the foundation for the modern scientific method. His work in advancing experimental techniques and the inductive approach to scientific inquiry is well documented in his essay Novum Organum. Bacon's influence was significant, and his methodologies inspired the founding of the Royal Society of London. This society continued to uphold Bacon's emphasis on experimentation and greatly influenced later scientists such as Isaac Newton.