Meet the Holy Trinity Institute Team

MALISSA MACKEY
Executive Director

  • Malissa has served on staff with the City Ministry of Cru since 2015, having directed the Campus Ministry in Detroit and Chicago for 18 years prior to that. In 2016, she began partnering with Holy Trinity to direct Faith & Work Chicago. Malissa holds a Master of Arts in Theological Studies from Trinity Evangelical Divinity School and is pursuing a Doctor of Ministry in Theology from Northern Seminary. She loves living in Wicker Park, traveling around the world, and cheering on her Chicago Cubs.

JON DENNIS
Senior Director

  • In addition to his work as co-founder and Senior Pastor of Holy Trinity Church, Jon is the Lead for Vision and Strategy for Neopolis which focuses on training leaders in preaching, pastoring and planting to influence the world for Christ. In the past he has served on the Local School Council for his children’s Chicago Public School and helped launch The Charles Simeon Trust as well as The Chicago Partnership.

    Jon earned his Doctor of Ministry from Westminster Theological Seminary in 2019 and also has earned master’s degrees from both the University of Chicago and Trinity Evangelical Divinity School and a bachelor’s from Bethel College. He is the author of Christ + City and, for over 25 years, has lived in Hyde Park, Chicago, with his wife, Amy. He has five adult children and four grandchildren.

SULLY CURTIN
Associate Director

  • Sully is the Executive Pastor for Holy Trinity Church and Director of Ministries for Neopolis, a global church planting network. He received his M.Div from Trinity International University in 2017 and his Masters in Missiology from Edinburgh Theological Seminary in 2025. Sully lives in Wicker Park with his wife Laura, their sons, Callaghan and Jameson, and daughter, Kennedy.

DAVID ENGSTROM
Institute Associate

  • David is the Institute Associate and Youth Director at Holy Trinity Church, where he has served on staff since 2022. He earned his Master of Divinity from Trinity Evangelical Divinity School in 2022. David lives with his wife Kerrie in Humboldt Park, on Chicago's West Side. He enjoys good coffee, travel, and the family's pet tortoise, Mazzi.

ALYSSA WALKER
Teaching Lead

  • Alyssa is a Teaching Lead for the Holy Trinity Institute for Discipleship and Mission. She also serves on the HTC Women's Ministry team and is a proud KidCity teacher (go Red Line!). Alyssa works for the Charles Simeon Trust, where she oversees fundraising and communications and instructs at Workshops on Biblical Exposition for women. Prior to returning to Chicago ten years ago, Alyssa served as an HTC Global Ministry Partner in Croatia and the Democratic Republic of Congo. She holds an MA in Biblical Exegesis at Wheaton College and a BA from Moody Bible Institute in Biblical Languages. Alyssa lives in Hyde Park with her husband, Kevin, and two kids, Manny and Sayira.