YSC Staff

Sang & Charmain Yun

Sang and Charmain joined staff with YSC at a time when most students didn’t use email and Rose Walk (in front of SML) was a regular city street. Sang graduated from Yale in 1993 with a double major in Philosophy and Religious Studies and got his MDiv from Princeton Theological Seminary in 1996. Charmain graduated from Yale in 1995 with a double major in Sociology and East Asian Studies. They married in 1996 and have made New Haven their home since then, starting their work on staff in 1998.

Their son Jonathan (age 22) is wrapping up his studies at GA Tech. Kaylen (age 19) is a junior at Yale, and Navia (age 16) is in 11th grade at ESUMS, a New Haven public school. In 2018, Charmain transitioned out of full-time work with YSC. She received her MSW from UConn in 2021, and serves as the Executive Director at Christian Community Action, a local agency helping families experiencing homelessness. She is still involved with YSC as affiliate staff.

Contact: sang.yun@yale.edu

Alex & Bonnie Schurman

Alex studied Electrical Engineering and Computer Science, graduating in 2014. Bonnie studied English at Georgetown (BA in 2013, MA in 2017) and has served in college ministry ever since her undergraduate days.

Since the two of them met, Alex has become a fan of the Washington Nationals and college gymnastics, and Bonnie has learned to love cooperative board games and has begun to fumble her way through some of the dense theology books that Alex considers "fun" reading.

They love cooking, hanging out with their toddler Ruthie and baby Timmy, and playing board games—and would love for you to join them for all of the above!

Contact: alexander.schurman@yale.edu and bonnie.schurman@yale.edu

Jessie Cheung

Jessie came to faith in high school but learned how to truly live for God in college. Through college ministry, she saw others her age genuinely wonder what it meant to put Jesus as the center of their life beyond just Sunday sermons but in daily life decisions and worries. Jessie is so grateful for mentors and fellow believers who guided her through breakups, friendships, and mental health struggles and is so excited to do the same for others as staff!

Jessie graduated in 2024 with a degree in Cognitive Science and enjoyed teaching introductory Computer Science to non-tech majors, researching developmental psych, and serving as a Davenport Student Aide. In her free time, she loves having long conversations, trying new restaurants, watching medical shows, and playing games!

Connect: jessie.cheung@yale.edu

Dan Pai

Daniel joined staff with YSC in 2024 after a year of volunteering for men’s ministry and PnP. He graduated Yale with a major in global affairs and an advanced language certificate in French and spent big chunks of his time in Elmseed, YSC, and Living Water as well as helping organize interministry. After graduating, he started working for a consulting firm.

When Daniel is chilling, you are most likely to find him jamming to worship music on his guitar/ cajon or expressing his bromantic love for Kwaku. If you have questions about faith or need some encouragement, he’s always available to talk.

Connect: daniel.pai@cru.org

Past Staff Teams

  • 2017-2018

  • 2018-2019

  • 2019-2020

  • 2021-2022

  • 2022-2023

  • 2025-2026