Final answer:
Henri Cartier-Bresson is the artist who captured the photo 'Place de L'Europe Behind the Gare St. Lazare, Paris', showcasing a man leaping over a puddle which is a prominent example of his work in photojournalism and his ability to encapsulate the ephemeral moments of modern life.
Step-by-step explanation:
The artist who captured the iconic image of a man leaping over a puddle on a cloudy day in the photograph titled Place de L'Europe Behind the Gare St. Lazare, Paris, is Henri Cartier-Bresson. This photograph is especially notable because it exhibits a subtle moment of drama and reflects the potential for photography to capture individual moments in time. Through Cartier-Bresson's lens, viewers witness a slice of the racing tempo of modern culture that was omnipresent in growing urban centers of that era. With his keen eye for spontaneity and accuracy, Cartier-Bresson is often hailed as a pioneer of photojournalism, influencing the way moments in time are perpetually frozen and recollected through photography.