Our Team

Tara-Leigh Cobble

D-Group Founder & CEO

Her earliest memory is learning John 3:16 from her mom, shortly before her brother led her to Christ. Despite an early introduction to Christianity, she wasted years coasting on the second-hand information she learned from others. In 2008, through the gentle encouragement of a friend, she read all the way through the Bible for the first time. That changed everything. "I wanted and needed people alongside me in my pursuit of God -- people to hold me accountable for scripture memory and Bible reading and all the things that were bringing me so much newfound joy!" Out of that need, she started D-Group with a handful of strangers in a living room in 2009. She lives in Dallas, TX, where she has no pets or children - or anything else that might die if she forgets to feed it.

CALLIE
SUMMERS

Executive
Director

JOELLE
SMITH

Logistics
Manager

She grew up in a Christian home with loving parents, but her faith became her own in college. Her hunger for the Word of God flourished and she discovered the power of Christian community and discipleship relationships as catalysts for spiritual growth. A native Texan, she loves the beach and the mountains, and enjoys hiking, camping, and hammocking with her dog Oakley. She is a voracious podcast listener and book reader. She is continually pleased to be used by God to strengthen His kingdom! Callie is a member of Eastside Community Church in Dallas.

Though raised in the church, her life didn’t always reflect Gospel transformation. At a low point in her early twenties, two women approached her on the beach to remind her of God’s love for her. His pursuit of her never felt more real, and she began to fall in love with Him, the One who heals and restores. Shortly after that, she joined D-Group -- and even seven years later, she still counts it among her best decisions. Her desire is to live out the words of John the Baptist: “He must increase, but I must decrease” (John 3:30). Joelle is a member of Providence Wesleyan Church in Summerville, SC.

RACHEL
MANTOOTH

Administrative
Coordinator

LAUREN
MULFORD

Senior Management

Theology and Content Director

As the daughter of a Minister of Music, Rachel grew up being at the church "every time the doors were open." She became a Christian at the age of six but it wasn't until joining D-Group that she was truly challenged with the question, "Is what I believe deeply rooted in scripture or is it just what was taught to me as a child?" Through processing that question, God strengthened the truth of her faith and gave her a burning desire to know Him and His Word more. Rachel lives with her husband, Chase, and their two sons in Simpsonville, SC. They are members of Newspring Church in Greenville.

Lauren came to trust Christ with her salvation at the age of seven. She trained to be a professional ballet dancer with Ballet Magnificat and served as a missionary with them for three years traveling across the USA. She later went on to receive her bachelor’s degree in biology from the University of Texas at Arlington where she met her husband at a Bible study. D-Group catapulted her to “love God and love people” more than she had ever previously while maintaining doctrinal soundness. Her family of eight attends Hope Fellowship in Denton, TX.

WARWICK
FULLER

Men's
Director

Warwick’s life testifies to God’s loving pursuit of him. He went to college and seminary in PA, where he developed discipleship programs for individuals, groups, and families. He is an ordained minister in the ACNA, serving as a US Army Chaplain. Framing his life around Galatians 2:20, he wants to see everyone rooted in Scripture, surrounded by community, and able to articulate what they believe. He has a deep love for God’s Word and is happy to be a part of the D-Group movement! He is married with 4 kids and serves at Holy Trinity Anglican Parish at Fort Bragg.