Big Sister Association of Greater Boston (Boston, MA)


  • Name:Leigha Gillespie
  • Title:Corporate and Foundation Relations Specialist

Organization Address

  • Organization Name:Big Sister Association of Greater Boston
  • Address:161 Massachusetts Ave
    Boston, MA 02138
    United States

Organization Phone

  • Main phone:6172368060
  • Main fax:6172368075

Organization Web

User Email


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  • Mission:
  • Big Sister Association of Greater Boston helps girls realize their potential by providing them with positive mentoring relationships with women. Our vision is to create a mentor-rich community in which every girl has access to the individual nurturing, guidance and support she needs to become a confident, competent and caring adult.

  • Overview:
  • Big Sister Association of Greater Boston is the only Big Brothers Big Sisters of America (BBBSA) mentoring affiliate that combines established, research-based practices with a gender-specific lens proven to increase positive outcomes for girls. Big Sister is strictly local in our service to girls ages 7-20 throughout Greater Boston. We independently raise funding to bolster our programs, and 85% of our annual budget comes from private philanthropy. Big Sister’s mission is to help girls realize their full potential by providing them with positive mentoring relationships with trained women, specifically tailored to the age, stage of development, and unique needs of each girl.

    We partner with government organizations and area nonprofits to offer more robust services to Greater Boston’s girls, and to connect girls and their families to much-needed resources. Our partnerships include the Boston Housing Authority, the Boston Public Health Commission, the Boston Police Department, Mass Mentoring Partnership, Big Brothers Big Sisters of MA Bay, Bottom Line, and more than 50 schools and community centers throughout the region.

    Big Sister’s strengths include: our reputation in the communities we serve, as demonstrated by our strong relationships with community organizations; the dedication of our volunteer boards and mentors, as illustrated by their generosity and average length of service; our institutional knowledge and experience in the field of mentoring; our evidence-based model; and our sophisticated outcome measurement tools created by expert researchers. We have the infrastructure, skills, and experience to fulfill the unmet need for girls by matching them with compassionate women mentors in the community. Big Sister’s vision is to create a mentor-rich community in which every girl has access – without cost – to the individual nurturing, guidance, and support she needs to overcome challenges and become a confident, competent, and caring adult.

  • History:
  • Big Sister was founded in 1951 by three Cambridge residents who were troubled by the fact that, although the region had mentoring programs for boys, there were no such programs dedicated to supporting girls. The three founders believed that the region’s girls could also benefit from support and counsel from an adult outside of the home, and thus created our signature mentoring program in which girls (Little Sisters) are matched with caring, committed women mentors (Big Sisters). In our first year, Big Sister matched six girls with mentors; 63 years later, we serve more than 2,600 girls annually.
    In addition to serving an ever-increasing number of girls over the years, Big Sister has continued to develop new, innovative programs. We launched our first Group Mentoring program in 1986, and developed School-Based Mentoring in 2001. In 2003, we added Big for a Day, which includes fun activities to engage girls who are waiting to be matched with a mentor. In 2008, we started High School Mentoring Academy, a program that matches high school girls from Boston Latin Academy with elementary school girls from the Trotter Elementary School. This mentoring program focuses on leadership development for the high school Big Sisters and academic achievement for the elementary Little Sisters. Last year, we introduced a new program to meet the changing needs of girls: Real Choices Strong Voices (RCSV). RCSV is a workshop series designed to foster conversations between Big and Little Sisters, matched within our Community-Based Mentoring program, around puberty, sexual health, and decision-making.

  • Year established:1951
  • Endowment:Unknown


  • Executive / Trustee board size:30
  • Advisory board size:
  • Staff size:52


  • Organization type:Grantseeker
  • Country of registration:United States
  • Tax Determination Letter:Received Determination Letter
  • IRS Section:501(c)(3)
  • Tax ID:04-2150651

IRS Business Master File Information

  • EIN:042150651
  • Sort (Secondary) Name:
  • Care Of Name:% THE AGENCY
  • Organization Address:20 PARK PLZ STE 1420
  • Organization City:BOSTON
  • Organization State:MA
  • Organization Zip:02116-4311
  • Group Exemption Number:0000
  • Subsection Code:03
  • Classification Code(s):1
  • Subsection/Classification Desc.:Charitable Organization
  • Affiliation Code:3
  • Ruling Date:December, 1955
  • Deductibility Code:1
  • Foundation Code:15
  • Foundation Code Desc.:Organization which receives a substantial part of its support from a governmental unit or the general public 170(b)(1)(A)(vi)
  • Activity Code(s):328
  • Activity Code Desc.(s):Combat juvenile delinquency
  • Organization Code:1 (Corporation)
  • Exempt Org. Status Code:01 (Unconditional Exemption)
  • Tax Period:December, 2016
  • Filing Requirement Category:01 (990 (all other) or 990EZ return)
  • Accounting Period:December
  • NTEE Code:
  • Asset Amount:$4,481,759
  • Asset Code:6 ($1,000,000 - $4,999,999)
  • Income Amount:$3,923,041
  • Income Code:6 ($1,000,000 - $4,999,999)
  • 990 Revenue Amount:$3,606,368
  • Last Updated:2/18/2018 11:55:28 am

This information is directly from the IRS Exempt Organization Business Master File at Exempt Organizations Business Master File Extract. This information is not under the control of the Common Grant Application and is collected and compiled and can only be changed by the IRS.