Alumni Spotlight: Ellen Ren (’24MA, Quantitative Methods in the Social Sciences)

What is your current job title?
Sustainability Data Analyst, Department of Buildings, Sustainability Bureau.

What are you working on now?
I work on one of New York City’s most ambitious sustainability efforts: decarbonizing its buildings. My focus is on Local Law 97, which aims for net-zero emissions by 2050. As a data analyst, I interpret data on building characteristics and energy use to inform policy decisions, guide enforcement, and help communicate progress on the city’s climate goals.

Was there a particular moment or experience that influenced your decision to pursue your current career path?
One of my earliest influences came while teaching conservation at the Bronx Zoo. Translating environmental concepts for city visitors—many of whom, like me, grew up surrounded by concrete—showed me how urban spaces could lead on environmental change. That experience shaped my interest in the intersection of cities, people, and sustainability.

What lessons from graduate school have you found useful in your professional life?
The QMSS program taught me the importance of communicating across disciplines. Even with strong technical training, the ability to explain data insights to lawyers, engineers, and policymakers is crucial. I work on a small data team, but collaboration is everything. Our results only matter if others can use them.

What skill has unexpectedly helped you in your career?
Teaching. As a TA, I learned to look at questions from multiple angles and make data approachable. That same mindset helps me now. Empowering colleagues to explore datasets has led to more collaborative and creative analyses.

What is your favorite memory from your graduate years?
The moments spent with classmates—trying new foods, biking through Central Park, and late-night conversations after classes. Those everyday experiences built friendships and helped me appreciate the city in new ways.

What was your favorite part about studying in New York City?
Although I grew up here, experiencing New York through the eyes of classmates from around the world made me see it differently. Exploring new neighborhoods, cuisines, and traditions with them deepened my love for my hometown.

What are your passions outside of your work?
I’m passionate about photography, capturing the beauty hidden in everyday urban life. I also enjoy mentoring students and staying involved in campus events where alumni can share career advice. And, as my coworkers know, I’m always on the lookout for great new lunch spots!

What is your advice for current GSAS students?
Explore as much as you can. GSAS is incredibly diverse—take classes outside your comfort zone, join events, and embrace the city. Some of the most valuable experiences you’ll have are the unexpected ones.

What is next for you, professionally or otherwise?
I plan to continue working at the city level, where climate policy becomes tangible. I want to deepen my understanding of how environmental change affects communities and to keep pushing for local solutions that make cities more resilient and equitable.

What motivates you to give to Columbia?
As a first-generation student, I know firsthand how transformative Columbia’s opportunities can be. Giving back ensures that others like me can continue to access those same resources and pursue their goals.