This is a question that the answer to it is not clear: some say that the occupation is not a predictor of suicide , but (see below) some professions are prone to suicide.
And in fact, points out Ronald Maris, PhD, director of the Center for the Study of Suicide and Life-Threatening Behavior at the University of South Carolina, "Occupation is not a major predictor of suicide and it does not explain much about why the person commits suicide."
http://www.apa.org/monitor/jan01/suicide.html
Some larger studies in the last few years provide at least some thought-provoking questions about connections between jobs and suicide. For example, in 1997, NIOSH and other government agencies analyzed 1980-84 death certificates by all occupations and causes of death, and found statistically significant elevated rates of suicide for:
• White male physicians.
• Black male guards (including supervisors, crossing guards, police, protective service occupations, but not correctional institution occupations).
• White female painters, sculptors, craft-artists and artist printmakers.