The investigators are looking for volunteers who have a history of Major Depressive Disorder, the Winter Blues, or Seasonal Affective Disorder or healthy volunteers who do not have a history of these disorders for a research study on genetics.

The investigators are looking for volunteers who have a history of Major Depressive Disorder, the Winter Blues, or Seasonal Affective Disorder or healthy volunteers who do not have a history of these disorders for a research study on genetics. Participation involves one 2-3 hour visit involving two diagnostic interviews, DNA collection, and questionnaires.

Inclusion Criteria:

• SAD or MDD
• healthy control

Exclusion Criteria:

• drug or alcohol dependence
• Bipolar Disorder

community sample

Summary data will be provided upon request to collaborators.