*Reduced cost professional memberships are available for scientists residing in countries classified by the World Bank as having low-income or lower-middle-income economies. Please review the list of qualified countries before selecting this category.

Student memberships are available for individuals currently enrolled in a college or university. Student members may be asked to provide verification information to confirm eligibility for this category. As GS membership requires at least a Bachelor's degree in one of the fields listed above, this category is primarily for graduate students. Graduate students from countries classified as having low-income or lower-middle-income economies are eligible for free Introductory Student Memberships. Current undergraduate students may subscribe to the society's publications (refer to "Join as a Subscriber" sidebar).

Senior memberships are available to individuals who are retired and at least 65 years of age.