Are you not a practitioner if you contribute to the field...? Seems impossible to meet your criteria.
What's a pure philosopher? Are Frege and Decartes not philosophers because they also did math? Does Alan Turing count? What about Popper and Kuhn? Are they philosophy enough for the philosopher club? Where, when, how and by whom do you think the concept of 'empirical science' was derived?
To be clear, everyone, including scientists, do philosophy every single day. You don't think Darwin did some philosophy in on the origin of species?
What's a pure philosopher? Are Frege and Decartes not philosophers because they also did math? Does Alan Turing count? What about Popper and Kuhn? Are they philosophy enough for the philosopher club? Where, when, how and by whom do you think the concept of 'empirical science' was derived?
To be clear, everyone, including scientists, do philosophy every single day. You don't think Darwin did some philosophy in on the origin of species?