Antonie van Leeuwenhoek is one I condsider to be a lifelong learner in the field of Medical Technology. As for why, personally I believe that going against the grain and reevaluating things without bias from what was assumed to be the factual answers of the time is an excellent trait of a lifelong learner. To not fall into complacency and seek further knowledge and improvement by utilizing one's unique skills and to challenge respected scientists of the time shows great dedication to the pursuit of excellence.