“Bjerknes was a Norwegian physicist who was born in 1862,” Hannah Fry writes in The New Yorker.
I would delete “who was” to make the sentence as simple and straightforward as possible. “Who was” doesn’t make anything clearer; these words don’t add any panache, or even any connotation.
As you’re writing, set your alarm to go off every time you use “who” or “that.” It’s often a sign you’ve gummed up your writing unnecessarily.
Also avoid using unnecessarily when you don’t need to.