Merv Stoltzfus, Conference Minister/Youth

Merv Stoltzfus, Executive Conference Minister

Merv Stoltzfus, Executive Conference Minister

Merv lives in Smoketown, PA with his wife Jan. They have one married daughter and a grandson. His responsibilities at ACC include supervision of the staff team and congregational ministries…equipping, encouraging and mentoring ministries. He desires to see pastors and lay leaders be successful in their ministry responsibilities, and encourages healthy practices for leadership teams so that they might lead effectively. Developing the gifts of all persons is a ministry priority. He has enjoyed opportunities to volunteer with Mennonite Church USA over the years in a variety of responsibilities. Merv is energized by the joy he has experienced through the last 40 years encouraging youth and adults to choose Faith and live life! He is passionate about healthy leadership and passing on faith to others through a wide spectrum of ministries. In his spare time, Merv enjoys his extended family and a variety of hobbies!

Joanne Headshot

Joanne Dietzel, Conference Minister

Joanne Dietzel, Conference Minister

Joanne lives outside of Strasburg with her husband Dan.  They have a son, Andrew, married to Julie, and a daughter, Angela.  They also have two granddaughters, Adelyn and Brenna.  Her responsibilities include supporting, encouraging and resourcing pastors, resourcing congregational leadership groups, and connecting with pastoral clusters.  Joanne desires that pastors and lay leaders not only do their best in carrying out ministry responsibilities, but that they do so with joy and a passion for Christ’s church.  She is energized by learning to know people and hearing their stories, as well as encouraging people in their life journey.  In her spare time, Joanne enjoys planning for and leading worship, playing piano, reading, greenhouse “hopping”, gardening, shopping and being grandma to her granddaughters.

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Sylvia Shirk, Conference Minister for New York City

Sylvia Shirk, Conference Minister for New York City

Sylvia E. Shirk is grateful that in Christ, we “have life, and have it abundantly.” (John 10:10) Her ministry experience includes campus ministry in Indiana, pastoral roles in New York, Indiana and Massachusetts, and mission work in Belgium. She studied at Anabaptist Mennonite Biblical Seminary, and graduated from Episcopal Divinity School and San Francisco Theological Seminary. Sylvia works part time with immigrants in New York courts as an interpreter of French and Haitian Creole. She has four amazing grandchildren, and is mother of two daughters and a son.


Dwight Rohrer, Conference Youth Minister

Dwight Rohrer, Conference Youth Minister

Dwight lives in Manheim PA with his wife Jenny. They have four adult children and two grandchildren. He grew up in the Neffsville congregation and serves there as Associate Pastor of Youth Ministries since 1999. He will be serving ACC as youth pastor, encouraging and mentoring youth leaders and representing ACC for Mennonite Church USA. He loves youth and is passionate about seeing them become more like Christ. He enjoys hunting, skiing and carpentry.

Brook Musselman, Conference Coordinator

Brook Musselman, Conference Coordinator

Brook lives in Mountville with his wife Laura, son Silas, and daughter Annalie. He is a 2012 graduate of Eastern Mennonite Univeristy where he studied Peacebuilding and Development, Business Administration and History. Brook completed a six-month term with EMM as a YES team leader in Kenya, helped coordinate the Mennonite World Conference Global Youth Summit in 2015, and leads the Step Up program for MC USA conventions. Brook enjoys the fulfilling work of facilitating ministry with ACC, in addition to biking, backpacking, and warm apple cider.


Njoki Njoroge, Financial Secretary

Njoki Njoroge, Financial Secretary

Njoki and her husband Peter are originally from Kenya. They now reside in Ephrata, Pennsylvania with their two young boys. Njoki enjoys being part of the ACC family where she serves as the Finance Secretary, a role that has deepened her knowledge and understanding of how God uses His people to minister to others in different capacities.   Her favorite season is summer so she can go to the beach and tend to her flowers, but she is finding a lot of fun things that boys are into also.


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Lois Ann Mast, Resource Advocate

Lois Ann Mast
Resource Advocate (Resource Advocate)

Lois Ann works to raise awareness of denominational activities and resources as Mennonite Church USA Resource Advocate for ACC. She also serves as ACC’s Historian. She enjoys editing the quarterly Mennonite Family History, leading heritage tours to Europe, and the six grandchildren she and her husband, Lemar, share.

Cindy Petersheim, Conference-Related Ministries Council Coordinator

Cindy Petersheim retired from Messiah College after 15 of her 28 professional years in development fundraising.  Her career included training and expertise in charitable estate planning, major gifts, annual fund, and donor relations.  Additionally, Cindy worked as Director of Development at Lancaster Mennonite High School during the first past of her career. Cindy studied at Millersville and AMBS.  She moved to Morgantown to her husband’s (Bob) home area 15 years ago where Bob has served as pastor of Conestoga Mennonite Church for the past 10 years. Past Board involvements included Bridge of Hope – National and United Disabilities Services/Development. Present Board involvements include Home International (India orphanages) and Tel Hai Retirement Board.  Bob and Cindy have two grown daughters and 5 grandchildren.  Hobbies include traveling with friends, book club participation and keeping up with the grandchildren.

Lemar & Lois Ann Mast, Conference Historians

Lemar and Lois Ann Mast serve as ACC Historians and are available to assist persons preparing for church anniversaries.  This includes compiling a booklet or book to pass on to future generations.  “The lines are fallen unto me in pleasant places; yea, I have a goodly heritage.”  Psalm 16:6.