irs program accomplishments · form 990 part iii · fy2024
What they reported doing
- #1 primary $871KTHIS ORGANIZATION ALSO OPERATES A MONTESSORI TEACHER EDUCATION PROGRAM, THE WSMS-TEP PROGRAM, FOR TEACHERS WHO WISH TO OBTAIN THEIR MONTESSORI TEACHING CREDENTIALS.
- #2 $12KPROVIDING GENERAL EDUCATION SUPPORT TO UNRELATED ORGANIZATIONS WITHIN THE COMMUNITY.
named programs · 4 · from sources
What they call their work
After Lunch Bunch (ALB)
Daily enrichment program for five-year-olds focusing on topics such as muscles, architecture, agriculture, geography, and culture to prepare for kindergarten.
Early Childhood Program
Montessori-based education for children ages 2.9 to 6, focusing on language, math, sensorial development, practical life, cultural awareness, and physical activity.
Twos Program
Specialized Montessori curriculum for two-year-olds emphasizing independence, self-care, social development, and a gradual introduction to classroom routines.
WSMS-TEP Program
Accredited Montessori teacher education program that trains and credentials educators in Montessori methods.
activities · 6 groups
What they do
-
Montessori Education Programs 2 activities
- Operate early childhood programs for infants, toddlers, and twosProvides Montessori early childhood education for children from 3 months to 6 years of age, including dedicated Infant Toddler and Twos programs. The school offers 75 childcare spaces across seven specialized environments and operates a facility at 212 West 95th Street designed specifically for these age groups.
- Provide Montessori education for children from infancy through 8th gradeDelivers Montessori-based academic and developmental programming for children from 3 months to 14 years of age, including early childhood, elementary, and middle school levels. The school enrolled 233 students for the 2025–2026 academic year and maintains a student-teacher ratio of 1:4 in the Twos Program and 1:5 in Multi-Age classrooms.
-
-
Summer Day Camp Programs 1 activity
- Deliver summer and extended-day programming for enrolled childrenOffers summer vacation classrooms staffed by regular teachers and themed day trips to local parks and gardens. Also provides a late afternoon program with extended-day hours from 8:30 a.m. to 5:30 p.m., including early drop-off and late pick-up options, running on either an 11-month or 9-month schedule.
-
-
Financial Aid and Scholarship Access Programs 1 activity
- Offer tuition assistance and financial aid programsProvides tuition assistance to 20% of enrolled families through institutional funding and an annual auction that supports the Founders Fund for Financial Aid, ensuring access to education across diverse economic backgrounds.
-
-
Teacher Professional Development 1 activity
- Operate Montessori teacher education and certification programRuns the WSMS-TEP Program, a Montessori certification program that trains over 100 student teachers annually and supports educators in obtaining Montessori credentials.
-
-
Children's Play and Motor Development Spaces 1 activity
- Provide on-site facilities supporting child development and family engagementOperates a three-floor facility with dedicated indoor and outdoor spaces including a full-size gymnasium, rooftop play space with Snug Play equipment, traverse climbing wall, indoor play floor, and lactation room. Also includes a library/parents room and full-service chef’s kitchen that prepares meals for students.
-
-
Family-School Engagement Programs 1 activity
- Support community and family engagement in educationEngages families from multicultural, multiethnic, multireligious, and multilingual backgrounds and invites parents to share traditions with classrooms. Organizes parent volunteers through a structured leadership team of committee chairs and class representatives.
-
financials · form 990 · fy2024
revenue
Total revenue$15.09M
Contributions & grants$2.73M18%
Program service revenue$11.68M77%
Investment income$669K4%
Other revenue$13K
expenses
Total expenses$15.25M
Program expenses77%
Admin / overhead20%
Fundraising3%
Salaries & benefits$9.69M
Grants paid out$1.18M
Largest expense lineCompensation
balance sheet
Total assets$51.80M
Cash$3.87M
Investments$12.82M
Liabilities$22.74M
Net assets$29.06M
Liquid reserves13.1 mo
5 years on record · 2020–2024 · YoY revenue +19.2%
leadership · form 990 part vii · fy2024
Who runs it
paid leadership · 8
| Name | Title | Hours/wk | Compensation |
|---|---|---|---|
| MIMI BASSO | HEAD OF SCHOOL | 40 | $535K |
| MATTHEW BLOOM | CFO | 40 | $244K |
| AMY STONEY | DIRECTOR OF OPERATIONS | 40 | $215K |
| MELISSA MACK | ASSOCIATE DIRECTOR | 40 | $203K |
| LISANNE PINCIOTTI | DIRECTOR OF TEP | 40 | $201K |
| KATHERINE FORDNEY | EDUCATIONAL DIRECTOR | 40 | $185K |
| NADINE CARROLL | ASSOC. HEAD OF SCHOOL | 40 | $178K |
| GRETCHEN AMBERG SLACK | HEAD TEACHER | 40 | $168K |
board members · 17
- ALEX WASCH — TRUSTEE
- ANKUR KESWANI — TRUSTEE
- ANNIE KIM — TRUSTEE
- AVNER HUSEN — TRUSTEE
- CHARLENE SU — TRUSTEE
- CHRISTINA WANG — TRUSTEE
- DANA BLISS — VICE-PRESIDENT
- ELIZABETH MARTORELLA — TRUSTEE
- ELIZABETH TYNDELL — TRUSTEE
- ELLIE BURROWS GLUCK — PARENT REPRESENTATIVE
- GEOFFREY KARAPETYAN — TRUSTEE
- GREG FELDMAN — TRUSTEE
- IVA MILLS — VICE-PRESIDENT
- JOHN FREDERICK THYE — TRUSTEE
- JORDAN BLITZER — PARENT REPRESENTATIVE
- JULIA EMANUEL — TRUSTEE
- KRISTIN CRAWFORD — TRUSTEE
relationships · 7
Who they work with
- Loren DeNicola Partner — Head of School responsible for day-to-day operations and leadership, hired in 2025.
- Nikki Chase-Levin Partner — President of the Board of Trustees, providing governance and strategic leadership for the school.
- Parents Association Partner — Collaborates with the school to strengthen family connections and support school community engagement.
- WSMS-TEP Network — Accredited Montessori teacher education program affiliated with West Side Montessori School, providing student teachers for the Late Afternoon Program.
- WSMS-TEP Network — Montessori teacher education program operated by West Side Montessori School.
- WSMS-TEP Program Partner — Teacher education program operated by WEST SIDE MONTESSORI SCHOOL to credential Montessori educators.
- WSMSTEP Network — Shares branding and affiliation with WSMSTEP (West Side Montessori School Teacher Education Program), indicating a close institutional relationship.
strategies · 3
How they approach the work
Named approaches extracted from this org’s sources. Where others share an approach, follow it to see the full set of orgs running it.
- Family and Community as Educational Partnersmethodology: family_partnership_in_educationBy engaging families as collaborative partners and modeling a kind, peaceful, and diverse community, the school enhances educational outcomes and social development because children thrive when learning is reinforced through consistent, respectful relationships at home and school.
- Identity-Affirming and Process-Oriented Learningmethodology: identity_affirming_educationBy cultivating a strong, positive sense of self through validation and visibility, and emphasizing the learning process over outcomes, the school builds intrinsic motivation and resilience because children develop confidence and a lifelong love of learning when their identities are affirmed and mistakes are normalized as growth opportunities.
- Montessori-Based Holistic Developmentmethodology: montessori_educationBy integrating Montessori principles with modern early childhood education practices, the school fosters resilient, creative, and independent problem-solving skills through a balanced focus on intellectual, social, and emotional growth because this integrated approach supports long-term cognitive and personal development.