Pastor Mack

Dr. Mack Sigmon

Pastor & Head of Staff
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The Rev. Dr. Mack Sigmon is a native of Charlotte, North Carolina, and a lifelong Presbyterian. Having served as a Deacon in his home congregation, Mack entered the University of North Carolina at Chapel Hill, and completed his undergraduate degree with majors in Religion (biblical emphasis) and English. After serving with the Peace Corps in Zaire, Africa, Mack entered Princeton Theological Seminary as a candidate under the care of Mecklenburg Presbytery (PCUS).

After receiving his M.Div. with a concentration in Reformed Theology, Mack was ordained and served as Pastor of Derita Presbyterian in Charlotte, North Carolina. During this time Mack married his seminary sweetheart, the Rev. Amy Sass, and they served as a clergy couple in Charlotte. After the birth of Mack and Amy’s daughter, Patricia, the Sigmons moved to Clearwater, Florida, where Mack served as Pastor of Peace Memorial Presbyterian. Amy served as designated pastor of Church of the Reconciler. Mack also served on the Committee On Ministry of the Presbytery of Tampa Bay for 10 years. During this time both Mack and Amy received the Doctor of Ministry degree from Columbia Theological Seminary in Decatur, Georgia.

After a decade of service in Florida, Mack returned and served as a Pastor of Sharon Presbyterian Church in Charlotte, North Carolina. Because Amy had received her interim ministry certifications while in Florida, Mack had the opportunity to observe her work and learn the nuances of the Interim Pastor, and decided to explore the possibility of this specialized ministry.

After his service to the Charlotte congregation, Mack and Amy served together as co-interims of Locust Presbyterian Church in the Presbytery of Charlotte. It was during this time that Mack received his Level One and Level Two training, which led to his first contract as Interim Pastor at First Presbyterian, Delray Beach, FL. Following Delray Beach, Mack served 2 years as Interim Pastor for the Worthington Presbyterian Church in Columbus, Ohio. Mack completed his last interim at First Presbyterian Church, Dunedin, FL, in 2016.  Mack also served as a “first responder” to a conflicted congregation at the invitation of Mission Presbytery, Texas. Their daughter, Patricia, recently graduated from Ringling School of Art and Design in Sarasota, Florida.

Mack has served the larger church as a Grader of Ordination Exams and on the Committee on Ministry, Education, Examinations, and Candidates Committees. Mack has also served on the faculty of the Interim Ministry Consortium, where has taught certification Levels I and II at Montreat, NC, and other locations.

Mack publishes a blog that is great, you can see it at He has an “open door” policy and can be reached on his cell at 704-430-8811 or by email at


Rev. William Voigt

Associate Pastor
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Rev. William K. Voigt, served Trinity Presbyterian as the Associate Pastor and Church Administrator. During his twenty-six years with the church, Bill brought gifts in preaching, teaching and pastoral care. He also worked with our mission and membership areas.  In addition, he brought to us his professional skills in church administration, in particular, financial and property management. Bill has worked with a number of churches and presbyteries helping to bring clarity to church/clergy law and tax issues. Rev. Voigt retired on May 31, 2019, but will continue to stay active in the ministry in some form.  

Born and raised in Southern California, Bill served in the Air Force following high school. He lived in Germany for three years and was able to travel to countries all over Europe. Rev. Voigt received his B.A. degree from California State (Los Angeles) and his M.Div., from Yale University’s Divinity School.

Prior to coming to Trinity and the Presbyterian Church (USA), Bill served several Congregational pastorates, in New England, Hollywood and Los Angeles. In Hollywood, he was active in programs to help prevent violence against women and children, working with those addicted and on the streets while, at the same time in both Hollywood and Los Angeles, ministering too many in the film industry. He has been active in promoting literacy, but most importantly, he feels blessed to help bring broken people of all walks of life, to a new and forgiven life in Jesus Christ.

Bill and his wife Jere enjoy family, traveling, classical and choral concerts, hiking, Southwest Indian culture, National Parks, movies, good books and genealogy (especially Bill).

You may reach Rev. Voigt by email at

Bruce C cropped

Dr. Bruce Chamberlain

Choral Director

Our Choral Director, Dr. Bruce Chamberlain, grew up in New Jersey, and studied at the Indiana University School of Music, where he earned both a Masters and a Doctoral degree. He taught at universities in Texas, Kentucky and Iowa before becoming Director of Choral Activities at the University of Arizona where he oversees the graduate program in choral conducting. He also travels as a guest conductor and workshop leader.

Since 2004, Bruce has brought his musical expertise to the leadership of the Trinity Choir. He and his wife, Peggy, enjoy their Tucson home, swimming and reading; they have 4 grown children.


Lynn Moser

Organist & Handbells Director

Our Organist/Handbell Director is Mr. Lynn Moser. Lynn is a native of Tucson, grew up at Trinity, and is now an elder in the church. A graduate of the University of Arizona, with a Masters degree in Music, he has served Trinity since 1988. He is accomplished at both organ and piano, conducts the Trinity Ringers (handbell and chime choir), and brings a wide range of musical gifts and interests to his ministry. He also teaches private piano lessons through the Moser Music Studio, located on the church campus. Lynn and his wife, Kathy, are active in the church; they enjoy photography and time with their dogs.

Matthew Kreamer

Matthew Kreamer

Youth Director

Matt is a born and raised Tucsonan, who only left the Old Pueblo to obtain his Bachelor’s Degree in Elementary Education from Whitworth College in Spokane, WA. During the week, Matt teaches Physical Education at Sycamore Elementary in the Vail Unified School District. On Sundays, Matt leads Kreamer’s Crusaders, a Sunday School class for ages 9-14, focusing on learning Biblical text and making those lessons relevant in their everyday lives. Matt has previously served as an Elder and as a member of the Long Range Development Team. He currently serves on the Christian Education Committee and has been a member of Trinity since 2011. Matt married Rona in 2006, and  has been blessed with one daughter, Cecilia Grace, and two crazy dogs, Dodger and Huck.

Rona Kreamer

Rona Kreamer

Young Adult Coordinator

Rona was born and raised in Cincinnati, Ohio, but has called Tucson home since July 2000. Rona obtained her Bachelor’s Degree from Winthrop University in Rock Hill, SC and her J.D. from the University of Arizona James E. Rogers College of Law. Rona currently works for the Town of Sahuarita, but on Sundays enjoys leading Anchor Trinity, a high school & college aged group focusing on fellowship, service, and tackling the tough questions of our faith. Rona married Matt in 2006 and has been blessed with one daughter, Cecilia Grace and two crazy dogs, Dodger and Huck.

Sheila Sievert

Sheila Sievert

Office Administrative Assistant
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Sheila Sievert is a native of Tucson, grew up at Trinity, and is now an elder in the church. Sheila is also the webmaster & technical advisor for Trinity.