"血液病学学者" can be translated into English as "hematologist" or "hematology scholar".
"Hematologist" is a more commonly used and concise term in the medical and academic fields, referring specifically to a professional or researcher in the field of hematology (the study of blood, blood-forming organs, and blood diseases).
"Hematology scholar" is also acceptable and emphasizes the scholarly or academic aspect of the individual's work, though it may be slightly less common in everyday usage.
In most contexts, "hematologist" would be the preferred choice.