Our Team

The team at ATOA Carbon is led by the CEO and Founder, Mr. Sami Osman. Mr. Osman is supported by several mid- and junior-level staff, each with carbon market experience and technical subject matter expertise including resource economics, statistics, software development, GIS, and artificial intelligence.

Sami Osman

CEO & Founder

Mr. Osman has over a decade and a half of experience consulting to industry and government on climate change policy and particularly carbon offset markets. His experience spans Africa, Australasia, Europe, and North America, where he has advised over a dozen governments and multilateral agencies, and many dozens of companies on advancing their offset programs, and broader ESG efforts. Sami has developed over a dozen carbon offset protocols, across multiple programs and jurisdictions, has advised dozens of projects and verification bodies, and has overseen the issuance of millions of offsets. In addition to his carbon market industry experience, Sami is a trained lawyer, has an international business degree, and training in risk management and project management.

Justin Sewak

Director, Operations

Justin is a passionate climate advocate and a skilled project management professional with a robust foundation in international development. Holding a Master’s degree in International Development from the University of Pittsburgh, Justin seamlessly combines academic knowledge with hands-on experience, making them a proactive force in advancing climate action.

Their journey in sustainability and climate resilience commenced during high school, where Justin dedicated time to volunteering in environmental cleanups and tree planting. This early commitment paved the way for roles within the Peace Corps, International Development, and Carbon Credits.

Their Peace Corps service in Malawi significantly enriched Justin's understanding of natural resource management and sustainable development, emphasizing the critical roles of community engagement and gender empowerment in effective climate solutions.

Possessing a strong technical skill set, including proficiency in software such as Microsoft Office and Salesforce, coupled with multilingual fluency in Swahili, French, Tumbuka, and Chewa, Justin stands well-equipped to support climate-related projects. Their passion, skills, and diverse experiences make them an invaluable asset to any climate-focused organization dedicated to shaping a positive future for our planet.

Anna Mortimer

Director, Carbon Systems

Anna has over five years of experience working in the voluntary carbon market. During their tenure Anna has worked on developing GHG methodologies in various sectors under GHG programs such as Verra's Verified Carbon Standard (VCS) Program. In addition, Anna helped manage the 4000+ portfolio of projects certified under the VCS Program to ensure quality of credits issued, and under the CCB Program and SD VISta Program to ensure robust measurements of social and non-carbon environmental benefits. Anna also wrote and revised over 60 rules and requirements under the VCS Program, including significant safeguard requirements.

Anna has a particular interest in blue carbon and ocean ecosystems, and assisted in the development of the VCS peat and blue carbon methodologies.

Anna has had a lifelong passion for environmental conservation and ecosystem health. Anna grew up participating in trail restoration projects, and seagrass restoration projects in their local environment. Anna has a Bachelors of Arts in International Political Economy from Fordham University, with a concentration in Sustainable Business.

Whitney Nash

Analyst, Carbon Market

Whitney is focused on building carbon markets that are both scientifically credible and capable of driving real climate impact. Her work sits at the intersection of MRV and carbon strategy, with a focus on helping climate solutions scale in a way that is transparent, measurable, and rooted in science.

She joins ATOA Carbon from Indigo Ag, where she was part of the MRV team responsible for preparing data packages, coordinating third-party verifications, and aligning cross-functional teams with evolving protocol requirements under the Climate Action Reserve’s Soil Enrichment Protocol. Her work spanned multiple reporting periods and contributed to the issuance of nearly one million carbon credits to date.

In parallel, Whitney led competitive intelligence efforts at Indigo, analyzing registry-listed carbon projects to assess program quality, track global market trends, and competitor strategies. Her work informed broader decisions around Indigo’s carbon program strategy and positioning.

She holds a B.A. in Environmental Science from Colby College, where she focused on marine and aquatic science. Her interest in nature-based climate solutions began with early research at the New England Aquarium and Bigelow Laboratory for Ocean Sciences. In addition, she engages with programs like Blue Generation to advance marine-based and nature-based climate solutions in the carbon markets.

Sebastian del Valle Rosales

Senior Advisor

Sebastián is a results-driven carbon technology leader with more than 18 years of experience spanning carbon markets, AI-driven carbon accounting, and industrial decarbonization. As a former Certified Lead Auditor for CDM and VCM projects, he supported validation and verification throughout the early development of global carbon markets, bringing a practitioner’s rigor to methodology application and data assurance. He has managed carbon credit portfolios across 100+ climate projects and led multidisciplinary product and delivery teams to build decision tools that optimize carbon intensity, strengthen MRV, and improve issuance outcomes. At ATOA Carbon, Sebastián applies this blend of technical depth and product leadership to help clients scale credible climate mitigation—from portfolio analytics to on-the-ground implementation. He has worked extensively across the Americas and Europe and is fluent in Spanish, English, German, and Portuguese.

Kun-Yuan lee

Director, Data Science and Digital Tools

Mr. Lee is a distinguished geospatial scientist with over a decade of experience spanning government, education, and private sectors, reflecting deep expertise in earth & climate science, remote sensing, and computational science. His professional journey demonstrates profound mastery in geospatial programming, data analysis, climate modeling, GIS automation, database management, and API development. In the education sector, Mr. Lee excelled as a Graduate Teaching Associate, skillfully integrating complex programming languages such as Python, MATLAB, and IDL into the curriculum, effectively merging theoretical knowledge with practical execution. His commitment to public service is evident through his significant contributions to national geospatial projects, underscoring his dedication to societal advancement through technology. In the private sector, Mr. Lee has made a marked impact with his development of innovative thermal mapping and data processing methodologies, as well as by enhancing the functionalities of geospatial products. His ability to develop robust data pipelines for cloud-based systems as an Integration and ETL Engineer highlights his aptitude for solving complex technological challenges. Mr. Lee's career stands as a testament to his pursuit of technological innovation, problem-solving skills, and dedication to the advancement of geospatial technology, making substantial contributions across a diverse range of applications.

Isaac Wilkins

Senior Analyst

Isaac Wilkins currently serves as a senior analyst at ATOA Carbon, where he supports the team in conducting due diligence, research and data analytics, to develop methodologies and scooping plans to help clients meet their climate goals. Isaac also serves as a consultant with Alpha Insights, where he helps project developers and investors navigate carbon markets, and explore clean tech investments. Prior to ATOA and Alpha, Isaac worked at the Climate Action Reserve supporting the programs team in evaluation, verification and registration of carbon offset projects. Alongside that Isaac aided in research and development of methodologies/initiatives centered around present and future climate mitigation. Isaac has a passion for social development work, specifically helping innovators and marginalized communities in the transition to clean technologies. He received his M.P.A in environmental science and policy from Columbia University and is a graduate of Howard University where he received his B.A in Political Science.

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Aside from our extensive experience and expertise, what stands us apart is our focus on identifying and mitigating risk, driving productivity, and communicating complex technical matters in plain English.