one-aftr was formed with the mission to create a 'collective good experience' in space. We use the vagueness of 'good' as a driving force of our inquiries.  We make sense of our surroundings through measured observation of everyday life and by considering viewpoints from other fields. We experiment with ways of working in  defining the 'good' through writing, making, curating, and building.

Our design expertise spans projects of various scales, including small objects, pavilions, buildings, and master plans. We approach each project uniquely, considering its economic, historical, and cultural context.

design strategy
We specialize in providing personalized design strategies tailored to institutional, cultural, and commercial projects. From conducting thorough feasibility studies to crafting unique programming, we offer a fresh perspective rooted in meticulous research and design thinking.

spatial design
We craft impactful and functional environments tailored to our clients' needs. From interiors to scenography, we collaborate closely with our clients to understand their aspirations and realize the true vision of each project.

for job, press, and project inquiries

247 W 46th St.
New York, NY, 10036
+1 609 480 6467


2f, 45-13 jangchungdan-ro 8-gil
Jung-gu, Seoul, 04614

+82 2 2264 4500


Joon Ma is a designer, educator, and co-founder of one-aftr. He received a Bachelor of Arts in Anthropology from Davidson College and a Master of Architecture from Princeton University, where he was awarded the Suzanne Kolarik Underwood Prize for his thesis. His work has been recognized internationally, most recently placing 2nd on the Europan 15 Vienna, shortlisted for the Dubai World Expo Korean Pavilion, and exhibiting at the Venice Biennale. His written work has been published in Rumor (Princeton), Paprika!(Yale), and Pool (UCLA). before founding one-aftr, he worked at OMA/AMO Rotterdam. He currently teaches at Seoul National University.  

Ryu Ahn is a designer, educator, and co-founder of one-aftr. He received a Bachelor of Arts in Architecture from Princeton University and a Master of Architecture from Columbia University. He has won and been selected as a finalist in several international architectural competitions and has recently been awarded by the Korean Institute of Architects (KIA), exhibiting his work at the Seoul Biennale of Architecture and Urbanism. Before founding one-aftr, he worked at The_System Lab and stpmj in Seoul and in New York City for SsD Architecture and Studio Daniel Libeskind.He currently teaches at Kookmin University.