Yes. While movies often talk about people "with two PhDs" (and yes, there are a few people who do that for some strange reason), a PhD prepares you to change fi

Yes. While movies often talk about people "with two PhDs" (and yes, there are a few people who do that for some strange reason), a PhD prepares you to change fields dramatically without any additional formal training. Much of molecular biology in the 1950s was created by physicists who decided to become biologists and who learned genetics and biochemistry and then created a new branch of biology. While not as dramatically, I myself have changed research topics several times since getting my PhD 25 years ago.