Our Team

matt hangenMatt has a B.A. and M.A in Biblical Theology and Missiology and is experienced in Business Management, Youth Ministry, and was a full time Missionary in Togo, West Africa from 2008 to 2013.

While serving as missionaries in West Africa, Matt and his wife Grace linked up with Water4 after searching for a better way to do manual well drilling than the way they were previously doing it. Water4 shared their desire to find sustainable solutions and do so out of a love for God and neighbor, so it was a perfect fit. And when ongoing medical treatments required their relocation to the U.S., Water4 was happy to gain someone with the field experience to travel and train up-and-coming drill teams throughout the world.

Matt is married to his best friend, Grace, and they live in the country with their amazing dog Penny and new puppy Nala.  After his wife and dogs, Matt’s favorite things are gardening, blacksmithing, motorcycles, classic literature, dancing with Pygmies, learning about and experiencing different cultures and worldviews, hiking and camping outdoors, etc. 

Matt’s favorite quote is “Each of us may be sure that if God sends us on stony paths He will provide us with strong shoes, and He will not send us out on any journey for which He does not equip us well.”  -Alexander MacLaren


grace hangenHaving worked in Togo as a missionary for five years with her husband Matt, Grace loves having the opportunity to work with Water4 from this side of the globe to continue helping the partners in the field. Even though they can’t be in Africa full-time anymore, her heart is still very much there, and it’s a blessing to still be involved in the work.

Grace is passionate about seeing lives and families transformed, and her favorite things include her husband, their dogs Penny and Nala, cooking and baking, experiencing God in His creation, gardening, reading, experiencing different cultures, traveling, camping, hiking, and many more…

Her favorite quote is, “Do not think that love in order to be genuine has to be extraordinary. What we need is to love without getting tired. Be faithful in small things because it is in them that your strength lies.” ― Mother Teresa


zack mccullockZack comes to us from EverFi, an education technology company that focuses on delivering critical life skills software to the public schools sector. Zack is also the co-founder of OKC GOOD, a nonprofit desiring to to amplify the voices of positive change agents in our neighbor-hoods and cities and is driven by the progress that Oklahoma city has made over the past several years toward being a more vibrant city.

During his undergrad at East Central University, Zack took time off to live in Uganda. He previously worked with Invisible Children on one of the most well-known internet campaigns to date, Kony 2012. He is currently in graduate school working towards his degree in Social and Civic Entrepreneurship from Bakke Graduate University.

Zack grew up in a large family that is very close, and is newly married to his beautiful wife, Jenna. His favorite things in life are coffee, traveling, bonfires, friendship, community and meaningful work.

Zack’s favorite quote is, “Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it's the only thing that ever has.” Margeret Mead


Michael Mitchell

Michael is a follower of Christ, a lover of people, and is always seeking to be better at both. He comes to Water4 with over a decade of leadership experience in higher education marketing & fundraising. He has a bachelor's degree in Marketing from Oklahoma Christian University and a master's degree in Education from the University of Oklahoma.

He is married to his high school sweetheart Annaleise. Together they are the proud parents of Isabella & Benjamin Mitchell.

Michael's blog "Life to Her Years: Dad's Tips for Adding Life to a Daughter's Years" (lifetoheryears.com) has been featured in numerous online and print publications, and in 2014 he published the book "Life Lessons for Dad: Tea Parties, Tutus & All Things Pink."

His favorite quote is, “The master in the art of living makes little distinction between his work and his play, his labor and his leisure, his mind and his body, his education and his recreation, his love and his religion. He hardly knows which is which. He simply pursues his vision of excellence at whatever he does, leaving others to decide whether he is working or playing. To him he is always doing both.” -James Michener


del palmerDel Palmer

Development Associate

Del comes to Water4 with a varied ministry background. He and his wife, Marilyn, were missionaries in Japan for 18 years. During this time, they were involved in the beginning of three Japanese churches and initiated a counseling and marriage ministry in Tokyo that continues today.

Upon returning to the states, Del joined a sports ministry working with professional athletes to carry a message of right choices and hope to the youth of America. He and Marilyn then began teaching marriage seminars in churches across the country. Del has also worked with various Christian non-profits assisting them in their fundraising structure and efforts.

The Palmers are passionate about helping churches and other civic groups and community groups to save lives physically and spiritually in Africa with Water4.

Del enjoys tennis and sailing. One of Del's favorite quotes is:  "No retreats, No reserve, No regrets!" ~Borden of Yale. One of his favorite verses is Ephesians 3:20 NLT  "Now all glory to God, who is able, through his mighty power at work within us, to accomplish infinitely more that we might ask or think."


jerry regierJerry has spent his career in public service, having formerly served as Secretary in the cabinet of two state governors (Oklahoma & Florida), and as an appointed policy leader for three U.S. Presidents. He is also the founder and first President of Family Research Council in Washington, DC.

During the past four years he has traveled extensively internationally interacting with policy leaders from developing countries as Senior Fellow of the Geneva Institute of Leadership & Public Policy (Geneva, Switzerland), and as a visiting lecturer at Kenya School of Government (Nairobi, Kenya).

Jerry is 4th generation Oklahoman and grew up the son of a pastor in Clinton. He and his wife Sharyn have four children and 10 grandchildren. Time with his family is one of his favorite things in life, and he also enjoys antique cars, bluegrass and country music, and being involved in nation building activities in the developing world.

He came to Water4 out of a desire to influence nations through leadership, policy and solutions— particularly solutions related to water and sanitation issues for the world's poor.


Dennis Ripley

Chief Business Development Officer

Dennis comes to Water4 from Opportunity International where he served as Senior Vice President for Programs and Chief Business Development Officer.  Prior to that he served as the Managing Director for the Refugee and Immigrant Services Division at World Relief. 

Dennis and his wife Debbie have four sons, two daughters-in-law  and four grandchildren.  Debbie and Dennis have sponsored refugee families from Azerbaijan, Laos and Cambodia and provided foster care for two young Vietnamese boys who were separated from their family during their escape from Vietnam. 

He holds a B.A. in Biblical Studies and a Master of Divinity degree from Trinity Divinity School.   He serves on the boards of Daystar University–US and the Opportunity Canada Foundation.

Dennis is a firm believer in building scalable and sustainable business solutions to poverty and came to Water4 because of the commitment to this approach.   Water4 has an expansive vision for Africa and a business model that will enable them to fulfill this vision.

One of Dennis’s favorite quotes comes from John Ortberg.  “If you want to walk on water, you have to get out of the boat.” 


Mike SlackMike Slack

Annual Giving Officer

Mike's passions are children and education. A husband and father of two, he's most fulfilled when he is engaged in projects that use his skills to improve the lives of kids and strengthen families. In that sense, his position at Water4 is more than a job for him, it is a vocation and a calling.

He’s built a career raising critical funding for causes he believes in, and he's excited that his experience has intersected with the opportunity to end the water crisis. “I can't imagine a better way to live out the call placed on my life than by growing the impact of Water4,” he says.

He earned a bachelor's degree in religion (summa cum laude) and a Master's degree in non-profit leadership from Oklahoma City University.


jim stewartJim spent 10 years as a professional musician and 20 years in the medical industry before landing at Water4, where his job is to connect churches and organizations with the work that Water4 is doing. What gets Jim out of bed in the morning is the urgency of knowing he is part of a solution that is saving lives, which drives him to do his part to further the cause. He is passionate about helping others and calling for the Church in America to rise up and show love the world.

Jim is married to his lovely wife Susan and they have three sons, two daughters-in-law and four grandsons. Jim's hero is his son Marquise who recently had his third kidney transplant and has never known a completely healthy life. Marquise reminds him daily that life is precious and there is nothing worth being anxious about.


margie strealyMargie has a Bachelor’s degree in Accounting from University of Central Oklahoma and holds over 30 years of accounting experience in a broad range of industries – retail, financial services, insurance, software development & services, oil & gas and now not-for-profit.

Margie has been married to her husband Joe for 31 years, and they have raised two sons, Bryan and Ben, and will soon add a daughter-in-law to the mix.

Margie loves family, friends and gardening and is passionate about demonstrating a positive attitude in everything she does. Her favorite quote is from Mary Catherine Bateson, “We are not what we know but what we are willing to learn.” 


Lynn WilsonLynn Wilson

Chief Executive Volunteer

With 28 years of military experience, it's no wonder we call him "The Colonel." Lynn is the man who knows how to get the job done, and he has taken Water4's facility from a rickety, drippy old building to a beautiful, fully-functioning office space.

Lynn is passionate about providing for his family, which consists of JoAn -- his wife of 50 years -- his two daughters, two sons-in-law and two grandsons.

Lynn enjoys singing in his church choir and reading good biographical history books, but what gets him out of bed in the morning is knowing he may be able to be a positive influence on those around him.


Emily Gross

Gift Processor and Donor Records Associate

Emily is a recent graduate of Johnson University in Knoxville, TN, where she earned a B.S in Human Services: Professional Counseling and a B.S in Bible and Theology.  

New to Oklahoma, Emily is excited to be closer to family and to begin life in a new city. Emily is passionate about children, displaced people groups, and showing genuine love and respect to all of Gods creations. She is excited to be apart of the Water4 team and to be able to see the positive and empowering work that they do.

Emily’s favorite Quote is, “ Don’t shine so that others can see you. Shine so that through you, others can see him.” – C.S Lewis 


Tanja Detwiler

Accounting Clerk

Tanja has a Bachelor’s Degree in Accounting and is currently working on her Master’s Degree in Accounting and Finance. Prior to getting her degree, she was a stay-at-home Mom and worked as an apprentice and a procurement clerk. She has been involved in various voluntary work including teaching, translations, and treasury. 

Tanja grew up in Wuerzburg, Germany where she met her husband while he was stationed in Kitzingen, Germany. They have three wonderful children – Jessica, Larissa and Mary.

Her favorite quote is an encouraging quote from Winston Churchill, “We are still the masters of our fate! We are still the captains of our souls!”