Answer:
A post-doctoral fellow is a researcher who has completed a doctoral degree and is engaged in further research and study
Step-by-step explanation:
In the context of Katie Bouman's career, the term "post-doctoral fellow" means that after completing her doctoral degree, she continued her academic and research pursuits by working as a post-doctoral fellow. This typically involves conducting research, publishing papers, and gaining further expertise in her field before potentially pursuing a career as a professor or taking on other roles in academia or research.