SUMASA Board 2022-2023.

Meet this year’s board!

Yoni Ronn, President

Yoni began his journey in the film industry before realizing that his true calling was in sustainability. He has experience in sustainable construction and is a partner at Zenigo, an ethical Mexican fashion brand. Currently, he is pursuing a Masters in Sustainability Management while hopping between NY and Tulum.


BriAnna Harris, VP of Academic Affairs

BriAnna joined SUMA in the Fall of 2020 during the COVID-19 pandemic and now joins the SUMASA Board as the VP of Academic Affairs in her final year of the program. Initially, she entered the program as a virtual learner to expand her current professional role in the Financial Services sector around impact investing and corporate reporting. In the Spring of 2022, she relocated to the city to continue in person as the campus re-opened and expanded her goals.
A life-long student of mindfulness in both personal and professional development, BriAnna is working on expanding our current thinking on behavior change associated with our planet’s rapidly changing climate and energy needs. She hopes to integrate tactical thinking on
sustainability management with strategic behavioral change initiatives to facilitate a smoother transition to a truly sustainable society.

When she is not working or studying, BriAnna enjoys new experiences, natural wellness, almost anything outdoors, and contemplating the universe.


Celine Leroudier, VP of Communications

Celine Leroudier is the new Director of Communications at SUMASA and is currently in her third semester pursuing an MS in Sustainability Management.

Prior to joining Columbia, Celine worked as a Project Manager at the Go Green Initiative, a non profit focused on environmental education in schools and the local community. She is excited to join SUMASA’s mission and continue her journey to exploring the built environment! 

In her free time, Celine listens to all kinds of music, mailing handmade cards to her friends, and daydreaming about her next toasted sesame bagel.


Tiffany Hodge, VP of Events

Tiffany joined SUMA in Fall 2021 after completing her studies at John Jay College of Criminal Justice where she graduated with honors in economics and environmental justice. During her undergraduate studies she focused on the socioeconomic factors that contribute to environmentally unjust communities. Her sustainability focuses in SUMA include: ocean conservation, food security and healthy communities. 

Tiffany is a full-time student and is on the board of Big Brothers Big Sisters New York’s Young Professional Committee where she serves as Events Chair. In her free time she enjoys playing tennis, volunteering for various local non-profits, pilates, chasing the sun, and finding the best tacos. 


Daniel Perkes, VP of Finance

Daniel joined the SUMA program in the Fall of 2021. He studied Economics and Finance at the William & Mary and began his career in economic consulting at Cornerstone Research. Next, Daniel worked on the Rewards team at Capital One. However, during the pandemic he decided to do a career pivot into clean tech and sustainability.

Daniel is interested in electric vehicles, energy storage, and zero-carbon energy technologies. In his free time, he enjoys


Mary Ivy Mbayah, VP of Community Outreach

Ivy is a Technology Consultant with 7 years of experience at Ernst & Young LLP. She currently works on the Global Innovation team, managing the ESG investment portfolio across Asia Pacific, Europe & Middle East and the Americas. Prior to this role, Ivy advised leading US banks on sustainable finance and climate risk. She leads EYs Americas-Africa Market Network (AAMN), an affinity group focused on being the pre-eminent connector and influencer in the EY US and Africa marketplace ecosystem.

She is pursuing an MS. in Sustainability Management at Columbia University to apply ESG practices to corporate governance, investment strategy and operations.

Prior to joining EY, Ivy worked in global wealth management at Bank of America Merrill Lynch, editorial finance at the Financial Times in London, and communications at the Coca Cola Foundation in South Africa. She holds a Bachelor of Arts degree with first class honors in Economics from Clark University and the London School of Economics.



Kristin Stuge, Symposium Co-Chair

Encouraging environmental change has been the core of Elsa’s career over the past few years. As a Project Manager her career has focused on building sustainable initiatives, like developing ReFashion Week with DSNY.

A previous AmeriCorps alumni she joined EDF Climate Corps in 2021 and stayed with her host organization Nice- Pak/PDI as CSR Manager. Working within the supply chain to make proactive impact in engaging suppliers on ESG initiatives, developing the CSR report and reporting to RSPO, CDP and FSC. 


Kristin Stuge, Symposium Co-Chair

Kristin enrolled in the SUMA program in January 2022 and expected to graduate in the spring 2023.

Kristin has an engineering bachelor form University of Exeter where she wrote her thesis on circular economy. Before joining Columbia she has worked in an IT start-up in Oslo and taken a course in programming at University of Oslo. 

She’s a keen skier and spent the first corona wave skiing in northern Norway. Other than that she enjoys hiking, tennis, and exploring the cultural scene of New York City.


Kristin Stuge, Symposium Co-Chair

With seven years of experience in relationship management, product and innovation, Ana Cristina has placed impact at the very center of her career from the very beginning. Incursioning from a very early stage in her career in the entrepreneurship ecosystem of LATAMA, Ana has worked for organizations like Endeavor and growing startups like Jüsto, managing innovation projects and events for industry leaders such as Cisco and Walmart, and leading strategic innovation projects to create technological products to accelerate the company’s growth.

As of today, Ana Cristina leads the fundraising efforts in the US. for FUNDES Catalyst, a venture builder creating companies that address the most latent problems of the bottom of the pyramid in LATAM. She is currently based in New York as she is pursuing a Master’s in Sustainability Management at Columbia University.