Depending on exactly what you are trying to convey, empiricist may fit. However, the term can mean somewhat contradictory things.
On one hand, empiricism means
experimental method; search for knowledge by observation and experiment
This is a critical aspect of the scientific method. While other factors also come into play in a scientific approach, many respected scientists would happily define themselves as empiricists.
However, empiricism also means
a disregarding of scientific methods and relying solely on experience
When the experiences that form the basis of an empiricist's viewpoint are limited to those that come his way by chance, the conclusions are most unscientific.
Finally, empiricism can also mean
(philosophy) the theory that sense experience is the only source of knowledge
This truly flies in the face of modern science and the scientific method.
[Note that all three definitions are from the same dictionary, Collins.]
[And, yes, I know that I counted on three hands.]