A Lion's Legacy
For nearly five decades, ISK has pursued excellence in education while remaining true to its core values of academic excellence, international-mindedness, cultural understanding, and service. Accredited by the Middle States Association (MSA) and the European Council of International Schools (ECIS), and offering the globally recognized International Baccalaureate (IB) programme, ISK provides students with an exceptional international education. From its beginnings in a single house near Nairobi Hospital to today's thriving Peponi Road campus, ISK has grown into a vibrant community that continues to shape responsible global citizens and lifelong learners.
1960's - 1970's
In 1967, Nancy Ellen Crooks founded the US Community School near Nairobi Hospital with a simple yet powerful vision: to provide world-class education to expatriate and Kenyan children. What began in a single house would become East Africa's most prestigious international school.
In 1970, the school relocated to a sprawling 40-acre coffee plantation at the end of Peponi Road when USIU purchased and expanded the institution. This move marked the beginning of ISK's journey on the iconic campus that remains our home today.
1980's
The International Baccalaureate Arrives
A landmark moment in ISK's history came with the introduction of the first International Baccalaureate (IB) classes in August 1982. This globally recognized program brought a new level of academic rigor, emphasizing inquiry, critical thinking, and international-mindedness. By adopting the IB, ISK joined a growing network of schools worldwide committed to preparing students for higher education and global citizenship. The launch of the IB program set the stage for decades of excellence and innovation in teaching and learning at ISK.
Elementary School Accreditation
In September 1982, the elementary school received accreditation from the Middle States Association of Colleges and Schools. This achievement validated ISK's commitment to educational excellence and laid the foundation for a comprehensive institutional evaluation, ensuring that young learners were receiving an education aligned with rigorous international standards.
Full School Accreditation
By November 1983, the school achieved full accreditation by the Middle States Association of Colleges and Schools, affirming that every division of the school met rigorous international standards and was prepared to serve its diverse student body with distinction. This dual validation—elementary in 1982 and full school in 1983—marked ISK's emergence as a fully accredited international institution.
A Presidential Visit
On November 21, 1982, ISK had the distinct honor of hosting George H. W. Bush, who visited the school and addressed the community during his tenure as Vice President of the United States. Many members of the wider Nairobi community attended, making it a memorable moment of pride for ISK. Bush would later become the 41st President of the United States.
1990's
European Council Accreditation
In 1991-1992, ISK achieved full accreditation from the European Council of International Schools (ECIS), cementing its position as a school that meets the highest international standards on multiple continents. This dual accreditation—from both Middle States and ECIS—demonstrated ISK's unwavering commitment to excellence and its standing as a truly global educational institution rooted in African soil.
Pre-Kindergarten Expansion
In 1989, ISK opened its new Pre-K building and welcomed its first class with four students. By the second semester, enrollment had grown to 15, marking the program's successful launch. This expansion brought ISK's educational reach to the youngest learners, establishing a pipeline of students who would thrive within the school's nurturing, academically rigorous environment.
Creativity, Activity, Service Introduced
Creativity, Activity, Service (CAS) was introduced as a core component of the International Baccalaureate Diploma Programme in 1992, designed to develop students' personal and interpersonal skills through experiential learning. CAS encourages students to engage in creative pursuits, physical activities, and community service, fostering balanced growth, global citizenship, and a commitment to making a positive difference in the world.
Urafiki: Birth of Service Learning
Urafiki became ISK's first official Service Learning Project in November 1992, marking the start of the school's structured approach to community engagement and experiential learning. Through Urafiki, students partnered with local communities to address authentic needs, connecting classroom learning with meaningful service while developing empathy, cultural awareness, and leadership skills. This initiative established ISK's enduring commitment to being not just a school in Kenya, but a school for Kenya.
2000's
Arts Centre Grand Opening
ISK launched a new chapter in student creativity when the Arts Centre officially opened its doors on January 15, 2000. The iconic facility became an immediate catalyst for campus arts programming, with "Royal Hunt of the Sun" performing as the inaugural production. The theatre became a hub for music recitals, dramatic performances, and visual art exhibitions that would define ISK's vibrant arts culture for decades to come.
ISK's 25th Anniversary Celebration
In February 2002, ISK celebrated a quarter-century of educational excellence with an anniversary celebration featuring an auction banquet, art displays, sporting events, and a talent show hosted by faculty and staff. The milestone reflected on the school's remarkable growth from Nancy Ellen Crooks' single-house vision in 1976 to a thriving, accredited institution serving over 570 students from dozens of nationalities—proof of ISK's sustained commitment to excellence and community.
High School Campus Development Groundbreaking
On November 8, 2006, ISK officially broke ground on a transformative facility expansion project designed to strengthen the High School program. The groundbreaking ceremony, initiated through collaborative input from school stakeholders and the 2003-2004 Buildings and Grounds Committee, marked the beginning of ISK's most ambitious campus development initiative to date. This expansion would reshape the institutional landscape for years to come.
New High School Opens with Nobel Laureate Wangari Maathai
On November 27, 2007, ISK celebrated the official opening of its new High School facility in a ceremony attended by U.S. Ambassador Michael Ranneberger and a representative from the Canadian High Commission. The ceremony's most memorable moment came when the ribbon was cut jointly by these diplomatic leaders and Professor Wangari Muta Maathai—the first African woman to receive the Nobel Peace Prize. Maathai then planted a tree on the ISK campus, a symbolic gesture honoring environmental stewardship and Kenya's green heritage. The opening of the High School facility demonstrated ISK's commitment to providing world-class infrastructure and its deep rootedness in Kenya's social and environmental leadership.
2010's
ISK Turns 40
On August 17, 2016, ISK celebrated 40 years of service to students and the Kenyan community with a colorful campus ceremony attended by dignitaries from the US Embassy and Canadian High Commission. Keynote speaker John Sibi-Okumu shared fond memories of ISK as both a parent and teacher, followed by a celebratory performance by the acclaimed African band Sauti Sol.
To mark this milestone, ISK partnered with Sauti Sol to strengthen community service efforts in Kenya. The partnership focused on the connection between education and creativity, supporting ISK’s service learning programs and Sauti Sol’s Soma Soma Initiative, which promotes access to education for youth across Africa. The collaboration provided meaningful peer-learning experiences for students while promoting the importance of education and community service.
Educational Aims Refreshed
In January 2018, ISK refreshed its Educational Aims to better reflect the school's evolving values and to articulate more clearly the attributes students would need to thrive in the 21st century. Rather than simply revising a document, the school launched a systematic effort to collect evidence of students living out these core principles—from elementary classrooms where young learners engaged in collaborative problem-solving, to high school IB seminars where students grappled with questions of global significance. This commitment to aligning institutional vision with daily practice ensured that ISK's stated aims were not aspirational rhetoric but a lived reality in classrooms and corridors.
Life-Centered Education Program Launched
In October 2018, ISK launched its Life-Centered Education (LCE) program, initially serving students with diagnosed intellectual or developmental disabilities from Pre-K to Grade 5. The program provided individualized academic and social instruction while deliberately integrating students into electives and after-school activities, embodying ISK's commitment that every learner had a place and purpose in the community. Recognizing the program's profound impact, ISK expanded LCE in 2021 to include middle and high school students, ensuring continuity and support throughout their educational journeys. By 2025, two LCE seniors graduated with modified ISK High School Diplomas, marking a proud milestone.
Surpassing 1,000 Students
In October 2019, ISK proudly surpassed 1,000 enrolled students, a historic milestone that captures the school's remarkable journey from Nancy Ellen Crooks' vision in a single house to an institution serving over 1,000 learners from more than 60 nations. To commemorate this momentous occasion, the entire community gathered on the field for an iconic photograph, a vibrant visual record of ISK's growth, vitality, and global character. This milestone celebrated not merely expansion in numbers, but the deepening of ISK's mission: to educate globally-minded leaders who would shape a more just and peaceful world.
2020's
Learning During the COVID-19 Pandemic
In March 2020, ISK faced an unprecedented challenge as the COVID-19 pandemic forced the closure of its campus to all but essential staff. The school quickly transitioned to online learning, ensuring continuity of education while keeping the community connected. The experience demonstrated that ISK’s strength extended beyond its physical campus, rooted in the resilience of its students, the dedication of its teachers, and the support of its families.
Despite the disruption, ISK celebrated a significant milestone on May 29, 2020, with its only virtual graduation ceremony. The Class of 2020 marked their achievement through a livestreamed event that brought seniors and teachers together online. In a memorable and personal moment, each graduate received their diploma from their parents at home, turning living rooms into stages of celebration and achievement. The ceremony honored the accomplishments of all 84 graduates and reflected the school community’s ability to adapt, persevere, and celebrate together during extraordinary times.
Celebrating 45 Years of Learning
The 2021-22 school year marked 45 years since ISK's founding in 1976. Yet this milestone came amid ongoing uncertainty from the COVID-19 pandemic. Schools worldwide struggled with operating safely while maintaining educational quality and community connection. ISK responded by making constant innovations to enhance the way students learned while prioritizing their safety. Hybrid models, enhanced sanitization protocols, outdoor learning spaces, and mental health support became woven into daily life. The 45-year milestone was a testament to institutional adaptability—the ability to honor a legacy while embracing necessary change.
International Recognition: ISK Wins Global Award
On January 18, 2022, ISK won the International School Awards' Community Building Award for Plastiki Rafiki, a student-led social enterprise tackling environmental pollution through grassroots plastic recycling. Among 261 applications from 48 countries, ISK's initiative was shortlisted for two awards. Grade 11 students Kurt and Anne presented to an international panel, demonstrating that ISK graduates don't merely learn about global citizenship—they practice it through tangible action.
Transforming Learning: The Big 5 Launch
In January 2023, ISK transformed its Educational Aims into practical, student-centered roles: the Big 5—Communicators, Thinkers, Collaborators, Self-Managers, and Changemakers. This framework gave students from Pre-K to Grade 12 concrete language to understand and embody ISK's values, serving as the foundation for learning and preparing students for futures they will shape.
A Decades-Long Dream Fulfilled: ISK Launches New Track
On November 8, 2023, ISK officially launched its new running track and field, fulfilling a decades-long vision. Distinguished guests—including the U.S. Embassy Deputy Chief of Mission, Canada's High Commissioner, and Olympic athlete Ferdinand Omanyala—celebrated the facility alongside ISK leadership and student-athletes. The track symbolizes the school's commitment to developing the whole student: academically, athletically, and personally.
Historic Enrollment
ISK reached its highest enrollment ever: 1,127 students from over 70 nationalities in August 2024. The trajectory—from 980 students in 2020-21 through pandemic recovery to 1,127 in 2024-25—reflects ISK's reputation and resilience. Yet this growth brings both opportunity and responsibility: maintaining ISK's commitment to knowing each student deeply while serving a community approaching 1,200 students.
50th Anniversary Celebration: Roots, Stories & Community
As ISK entered its golden jubilee year, the school embarked on a profound celebration of identity and belonging. In January 2026, ISK unveiled a commemorative 50th Anniversary Kanga—a traditional East African cloth symbolizing unity, identity, and belonging. This historic gesture marked ISK's deliberate embrace of Kenyan cultural symbols, expressing that ISK is not simply a Western institution in Kenya, but a school rooted in African soil, learning from and honoring Kenyan traditions.
Complementing this cultural affirmation, in March 2026, ISK published "ISK at the Table," a cookbook featuring 70+ recipes and stories from the ISK community. Created by seniors Ben, Pietro, and Lily as an IB CAS project (in collaboration with the Advancement Office), the cookbook celebrates the cultures, connections, and shared experiences defining ISK. More than a recipe collection, it serves as a tangible link for alumni worldwide and a window into ISK's culture for prospective families.
Together, the Kanga and "ISK at the Table" express a unified message: ISK's greatest achievement is measured not in buildings or accolades, but in the lives it touches, the families it welcomes, and the memories it creates. They affirm that for 50 years, ISK has been a bridge between cultures—a home away from home where food brings people together, stories matter, and diversity enriches the entire community.
Every milestone in our history is a testament to the strength of our community and our commitment to inspiring the next generation of leaders. We invite you to dive deeper and explore our historical timeline to discover the stories, people, and innovations that have built the ISK we know today.
From 1976 to 2018
2018 And Beyond