Theodor Koch-Grünberg was a German explorer and ethnologist born in 1872. He is best known for his extensive travels in the Amazon rainforest, where he studied the indigenous peoples and their cultures. His work contributed significantly to the understanding of the Amazon River and its diverse ecosystems. Koch-Grünberg published several important works, including detailed accounts of his journeys and observations. He collaborated with other explorers, such as Richard Evans Schultes, and his research laid the groundwork for future studies in ethnobotany and anthropology. He passed away in 1924, leaving a lasting legacy in the field of exploration.