There are scientists who became big players in a particular discipline but before that they made also more or less successful efforts in an unrelated branch of science. For instance, Kary Mullis, inventor of the Polymerase Chain Reacion (PCR) wrote an early and pretty bizarre cosmological letter entitled Cosmological Significance of Time Reversal published in no other science journal, than Nature. Or there is Robert Lanza, regenerative medicine expert, who had psychological papers in his Harvard youth. Whatever is the value of those early and usually B contributions, they say us something on the nature of specialization in science. I suspect that sometimes multitalent is just by coincidence, but there could be cases, when there is a deeper relation behind the multifaceted energy. In art, multitalent is a well-known phenomenon, think about the drawings and paintings of Goethe, or the violin of Ingres.
Help me collect other recent examples of surprising multitalent in the natural sciences.