get to know us

who we are

Climb 4 Climate is a non-profit organization that’s about breaking barriers to a greener world and having fun doing it. We unite thousands of stair climbers in stadiums nationwide, raising funds to combat climate change. Join the movement, bring your friends, and let’s climb toward a brighter future. Together we can make a difference and leave a legacy of sustainability to generations to come.

How it all began

Climb 4 Climate is the vision of two successful business people, who share a vision to leverage the power of community, uniting people of all ages and abilities to climb stadiums and raise money for climate change organizations.


Climb 4 Climate will have a national impact in the fight against climate change by motivating active people to raise funds through stair-climbing events. No one person can fix climate change. With the generous support of climate-forward brand sponsors and donors, climber raised funds are directed to the most immediate and measurable means of stemming climate change.

Our values

We lead with integrity, accountability, and transparency.

We are dedicated to creating meaningful change.

We work together to achieve more.

We care about our health, our community, and our environment.

Our Impact

Our volunteer Climate Advisory Board (CAB) will guide the direction of funds raised by climbers to fight climate change. Their charge is allocating funds to uses that will have a measurable and immediate impact on reducing climate change. Each member of the CAB represents a diversity of skills and knowledge, bringing years of experience in their respective area of climate expertise. The CAB members will be given an allocation amount, the amount the climbers have raised or are projected to raise in the coming months. CAC staff and management will accept the CAB’s allocation decisions and act on them with the approval from the Board of Directors. Members are not compensated for their involvement.


David Friedman,
Co-Founder & Chairman

David is a serial entrepreneur and CEO. David’s career in business started during the dot com boom. Later, David founded Boston Logic and grew the company into a leader in the real estate software vertical. The company went on to partner with Providence Equity and acquire 7 complementary products, later selling to Stone Point Capital. David then went on to found Knox Financial, a venture backed consumer fintech startup. After selling Knox in late 2022, David cofounded Climb 4 Climate along with Larry O’Toole with the mission to improve the health of climbers and the planet.

David advises startups from the earliest stages and serves on several boards of companies from pre-revenue to the middle/growth market. David’s background as an engineer, founder, and builder, and deep transactional experience makes him a confidant of CEOs and investors alike. On the weekends, David enjoys being a Dad, skiing, hiking, cycling, boating, carpentry, and cooking.

Larry O’Toole,
Co-Founder & Board Member

Larry O’Toole, the co-founder of Climb 4 Climate, is a visionary leader with a unique blend of passions: combating climate change, promoting athleticism, and fostering community impact. As the founder and leader of the acclaimed Gentle Giant moving company for over four decades, Larry has not only built a thriving business, but has also cultivated a culture of excellence and service. Under his guidance, Gentle Giant has garnered numerous awards for its exceptional service and workplace practices, employing a dedicated team of individuals proudly known as “Giants.”

Larry’s leadership prowess has been acknowledged by prestigious institutions such as The United States Small Business Administration, which honored him as its Massachusetts Small Business Person of the Year. His competitive spirit, discipline, and persistence drive him to tackle challenges with unwavering enthusiasm. Larry’s commitment to leading others is evident in his tradition of personally guiding new crew members through the iconic “running the stadium” ritual at Harvard University’s coliseum.

Beyond his professional achievements, Larry draws inspiration from his upbringing in Ireland and his background in competitive rowing. His rich personal experiences infuse his leadership style with authenticity, creating captivating events and inspiring moments for audiences of all backgrounds and sizes. With a deep-rooted dedication to making a positive impact, Larry continues to lead Climb 4 Climate with passion, purpose, and unwavering determination.

Ann Wells Crandall,
Chief Operating Officer

Ann Wells Crandall is a dynamic leader driven by a passion for building brands and businesses to achieve excellence, foster growth, and make a positive impact on communities. Successful launches include NBA League Pass, the out-of market sports subscription package at DIRECTV and the relaunch of the BIG EAST Collegiate Conference. With a rich background spanning over two decades across diverse industries including pro and college sports, media, auto insurance, and nonprofits, Ann has held pivot executive roles as Chief Marketing Officer for two organizations, Executive Vice President of Business Development & Strategic Partners at New York Road Runners and culminating in her current role as Chief Operating Officer at Climb 4 Climate.

Deeply rooted in community service, Ann actively contributes to organizations like God’s Love We Deliver, the Arthritis Foundation, Girls on the Run, and CASA of Pinellas County. She mentors emerging leaders through roles with Women in Sports and Events NYC (WISE), serves as a board member for Girls on the Run Tampa Bay, and holds the position of vice president at the St. Petersburg Downtown Neighborhood Association. Outside of her professional pursuits, Ann prioritizes wellness and maintains an active lifestyle through running, tennis, and strength training. She also finds joy in indulging her passions for arts, culture, spending time with family, and embracing lifelong learning.

Mindy A. Spire
Vice President, Development

Mindy is an accomplished growth and marketing executive with a diverse background spanning CPG, media, retail, and sports industries, ranging from start-ups to global organizations. Specializing in crafting measurable go-to-market strategies, orchestrating impactful product launches, and scaling business operations, Mindy brings her wealth of experience to Climb 4 Climate.

Passionate about empowering active lifestyles and creating a legacy of measurable impact, Mindy leads revenue generation and strategic partnerships at Climb 4 Climate to drive awareness for the nonprofit’s mission, audience development, and sustainable growth.

When she’s not working, she enjoys crossfit, fantasy sports, schmoozing, coaching, pop culture, sneakers. Mindy holds a B.A. from the University of Pennsylvania, and resides in Brooklyn, NY with her family.

Our impact - Climate advisory board

Our Advisory Board will guide the direction of funds annually. The board of advisors will report our measurable impacts based  on donations deployed. You’ll see what was built, how much carbon was eliminated, how clean power production was made, and the organizations we’ve helped supercharge with each C4C investment.

Rob Klee, ph.d

Rob Klee brings a wealth of experience to Climb 4 Climate as a member of the Climate Advisory Board.

Currently a lecturer at Yale School of the Environment, Dr. Klee holds a Ph.D. in industrial ecology, a law degree, and an undergraduate degree in geology and environmental science, all from Yale and Princeton respectively.

Previously, Dr. Klee served as the Commissioner of Connecticut’s Department of Energy and Environmental Protection (DEEP) from 2014 to 2019 under Governor Dannel P. Malloy. In this role, he led efforts to conserve natural resources, enhance outdoor recreation, and promote sustainable energy and environmental policies for Connecticut’s economy.

Before his state service, Dr. Klee worked as an attorney specializing in appellate and complex litigation, as well as energy and environmental law at Wiggin and Dana LLP in New Haven. He also clerked for the U.S. District Court in Connecticut and the U.S.
Second Circuit Court of Appeals.

Dr. Klee is committed to advancing environmental sustainability and conservation efforts through his expertise and leadership.

Andrew Eil

Andrew Eil (SPIA MPA *09) is a consultant specializing in climate change policy and capital markets, climate risk and resilience, and development finance.

He is currently Head of Climate Risk for North America with Tata Consultancy Services (TCS), where he provides advisory services for banks, insurers, and other financial institutions.

He has previously been a partner at Climate Finance Advisors, a boutique consultancy, and worked for the U.S. Department of State, World Bank Group, and UN agencies, among other clients, on climate change-related diplomatic initiatives, programs, and investing.

An active climate tech angel investor, Andrew is also an advisor to numerous climate tech startups and serves as a super-angel sourcing investment opportunities for Alumni Ventures. Andrew is an opinion writer for the Observer and Illuminem on sustainability and climate change issues.

Follow & Share