Tammie Collins is an advocate for education and children's health issues. While living in Atlanta, Tammie was on the Executive Committee for Art of the Season, tasked with recruiting and training hundreds of volunteers for a two-week, city-wide holiday arts and crafts event to benefit Scottish Rite Children's Hospital. Shortly thereafter, she chaired three events--The Pioneer Festival Fun Run, The Mad Hatters Tea Party and 'Tis the Season--to benefit The Foundation for Medically Fragile Children (children whose complex medical conditions require professional monitoring and supervision on a 24-hour basis to prevent life-threatening complications, prevent deterioration of health status, and/or maintain health status, often requiring financial assistance beyond insurance). Other Atlanta activities include The Atlanta Ballet Ball, Executive Vice -President of the Members Guild, Atlanta Historical Society, Co-Chair of the Atlanta Steeplechase and Chair of the Atlanta Speech School Gala.

After moving to Washington, DC, Tammie joined the board of Westmoreland Children's Center, chaired both the Beauvoir and Potomac School scholarship auctions, and twice chaired the Potomac School Book Fair. Tammie also served as the Potomac School Parent Association Chairperson in 2009-2010. June 2013 marked the completion of her second term as a board member of the Latino student fund (and three-time chair of the Latino Student Fund Gala), having helped the organization further its mission to "provide opportunities for a strong academic foundation for PreK-12th grade students of Hispanic descent to promote higher education and professional leadership." As a member of the Women's Committee of the Corcoran Gallery of Art (and an Executive Committee member for seven years), she chaired the Public Education and Outreach Committee, planned the Corcoran Annual Family Day, and also chaired the 2011 Corcoran Ball. She is current treasurer and PR chair for the Corcoran Ball.

She is also a founding member of the Council on Women's Leadership at Meridian International Center. In 2015, Tammie became a member of the S & R Foundation's Gala Committee, was named Executive Vice President for The Founders Board of St. John's Community Services and was admitted to the Sulgrave Club. Tammie and her husband John are currently in their second year as National Chairs of the Phillips Exeter Academy Parents Fund.

Tammie and John live in Washington, DC and are the proud parents of Margaret Anne, 18 and Patrick, 25.