Dr. Preston is a specialist who goes to areas that have been hit by natural disasters and works with teams there to manage the resulting crises among the members of the public who have been affected. Dr. Preston is most likely a(n) psychologist.

community                    

Explanation:

Community psychology is determined as one of the different branches in psychology that encompass the study of the way different individuals tends to communicate or relate to their specific communities and also the opposite effect of these communities in the individuals' life.

However, community psychologists research the problem, unpleasant, and undesirable situations of different communities to uncover various ways in order to make improvements.

Dr Preston is most likely a community psychologist.