Information collected will include such items as psychiatric diagnoses, genotypes of several neurotransmitter-related and brain growth-related candidate genes, presence or absence of brain, liver or other organ damage, history of the amount of past alcohol consumption, other substance use and family history of alcoholism. This information will allow investigators to determine for which, if any, NIAAA research studies a subject is eligible. It will also allow investigators to examine the relationship among various candidate genes and brain structure and/or function in alcoholism.