Dr. welker decided on his career path after seeing two of his grandparents experience alzheimer's disease. because he now works in the diagnosis and treatment of alzheimer's disease, he must be considered a(n)

neuropsychologist

Explanation:

Neuropsychology is in charge of studying human behavior and its relationship to brain functioning. Usually, a Neuropsychologist carries out his basic training in psychology and later acquires more specific knowledge in the field of neuroscience. This profession is extremely important in the treatment of neurodegenerative diseases such as Alzheimer's, so we can conclude that Dr. Welker is a Neuropsychologist.

The role of the neuropsychologist, in essence, is to evaluate, investigate, and create diagnostic hypotheses, then develop a treatment plan for the patient.