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Our Services

KO2 Consulting provides global strategic energy advisory services for large public corporations, non-profit organizations and private companies to achieve their organizational energy performance targets, operationalize their climate change initiatives and integrate energy strategy to overarching sustainability goals.


Strategic advising services to help you design your energy and sustainability programs


Assistance with carbon assessments, target setting, and data collection to measure results and impact

Implementation Support

Services to support net zero and high energy performance building design and construction

The Sectors We Are In

KO2 offers energy and sustainability services to clients in multiple sectors. Below is a selection of work by sector.

Transportation and Aviation

Real Estate

Real Estate


Government and Education

Education and Government

Arts and Film

Film and Arts

Our team

Ozgem Ornektekin headshot

Ozgem Ornektekin, LEED AP BD+C, ENV SP

President and Founder

Ozgem Ornektekin is the President and Founder of KO2 Consulting, providing strategic sustainability and energy planning, carbon footprint assessment, implementation, and management services for large public and private organizations. Prior to founding KO2, Ozgem served in leadership roles including Chief Energy Management Officer for the City of New York, Director of the Office of Sustainability at New York University, and Director of Sustainability at NYC Department of Education. Ozgem holds an MBA from Columbia Business School and a BS in Mechanical Engineering from the University of Denver.

Ellen Zielinski

Senior Vice President of Strategy Development

Ellen Zielinski is Vice President of Strategy Development for KO2 Consulting. Ellen has expertise in the development and implementation of energy and sustainability programming for large public and private organizations. Ellen leads the development of sustainability-related strategy documents such as climate action plans and energy master plans. Ellen’s expertise includes building and transportation decarbonization, renewable energy, waste reduction, climate education, and building thriving, sustainable cities. Ellen holds an MPA in Public Policy from New York University.

Stefani Demetriou

Sustainability Manager

Stefani is a sustainability professional with a passion for efficient, human-centric, and sustainable cities. She is experienced in driving change towards more sustainable practices in buildings, organizations, and cities across the US and Europe, to reduce greenhouse gas emissions and improve climate resilience. Stefani has helped buildings comply with Local Laws 87 and 97 in New York City. She has a bachelor’s in Environmental Engineering and a master’s in Sustainability in the Urban Environment from City College of New York.

Jocelyn Groom, LEED GA

Sustainability Consultant

Jocelyn Groom is a Sustainability Consultant with a proven record of innovation and leadership in sustainable strategies, environmental management, ESG strategy, and experience as a senior administrator in the nonprofit arts realm building exhibitions. Jocelyn’s focus is on creating environmental policy and innovations for organizations and her expertise also includes green building certifications for affordable housing and schools. She completed her master’s at Harvard University’s Sustainability and Environmental Management program.

Wolfgang Werner, RA, LEED AP BD+C, CPHC, ENV SP

Sustainability Architect

Wolfgang is a Registered Architect with extensive building sustainability knowledge and related consulting and education experience. Wolfgang’s expertise includes general building sustainability concepts, strategies, and technologies across disciplines, LEED rating systems and other green building certifications, energy codes and standards, regulations, incentives, embodied carbon, high-performance building envelopes, and corporate sustainability. Wolfgang has a Master of Architecture from Pratt Institute, and also runs his own sustainability consultancy doubleudoubleu, inc.

Our Commitment

As a commitment to our clients, customers and the planet, KO2 Consulting has set SME targets with SBTi to reduce our carbon footprint. Our baseline 2019 Scope 1 and Scope 2 emissions are 0.4 mtCO2e.  As of 2023 our company has achieved net zero emissions.

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Our Address

1325 Avenue of the Americas, NYC