Tremble Clefs Arizona is a non-profit 501 (c)(3) Charity




Don Dotts graduated from Arizona State University and then joined the staff as Alumni Editor. Later he became Executive Director of the ASU Alumni Association, a position he held for 26 years. He spent 42 years on the ASU’s administrative staff. Retired, Don is president of Tremble Clefs Arizona and chairman of the Original Tremble Clefs. He is also on the Board of the Parkinson's Network of Arizona and serves on 5 other non-profit boards in Arizona.

Don’s late wife, Annis, had Parkinson’s disease. They joined Tremble Clefs 20 years ago. Annis had been a music teacher and she really enjoyed Tremble Clefs. Mr. Dotts was amazed at the wonderful effect TC's music therapy had on people with Parkinson’s. When she passed away 9 years ago, he decided that he had to remain involved to help keep this wonderful program thriving.



Born and raised in southern Colorado, he ventured along several pathways before settling on a career with Arizona State Government; the last 21 years as the Ombudsman/Problem Resolution Officer for the Arizona Department of Revenue. He retired six months after being diagnosed with Parkinson’s Disease (12 years ago). He joined the Westside Tremble Clef’s four years later and currently serves as Vice President of this group and of Tremble Clef’s Arizona, our 501 C3 umbrella organization overseeing the current three (soon to be 4) active choirs in the greater Phoenix area. John is convinced that singing enables those with Parkinson’s to have a voice for a much longer time than those with PD who don’t exercise their voices and, as such, enjoy a better quality of life. I invite all individuals with PD to find a choir to join and help us to make a joyful noise together.

Donna Williams Rosenheck earned an undergraduate degree from UCLA and, later in 1997, a Master’s in


Donna Williams Rosenheck earned an undergraduate degree from UCLA and, later in 1997, a Master’s in Library and Information Science from the University of South Florida. She and her husband Al lived 17 years in Europe - in London, Milan and Brussels and stateside in CA, FL and AZ. Donna has worked as a mother, volunteer, administrative assistant, teacher and librarian. Before moving to Arizona, she was employed as a Reference Librarian and Literacy Coordinator by the Lee County Public Library System, FL. Her last teaching assignment was as an elementary teacher at the International School of Brussels, Belgium (1984-1991).

 When Al was diagnosed with Parkinson’s in 2004, they immediately shared with family and friends and learned as much as they could about the disease. After their move to Arizona, they were directed by staff at the Ali Center to the Scottsdale Tremble Clefs. That was in 2009. From the beginning they developed friendships and were active in the group. Having experienced the positive difference Tremble Clefs made to their lives, Donna, a widow, continues her support of Tremble Clefs Arizona. 



Kevin Riley earned his Bachelor’s degree in Marketing from the University of Arizona in 1981. He spent 29 years with the State of Arizona as a programmer before retiring in November 2018. His father had Parkinson’s disease for ten years and joined the Original Tremble Clefs in 2001. His father and mother were active members of Tremble Clefs. Kevin joined Tremble Clefs in January 2009 in memory of his father. Previously a poor singer and public speaker, Tremble Clefs has helped him develop confidence and his singing voice to the point where he now performs at concerts with the group. In his spare time, he enjoys golfing and hiking, having recently completed part of the Camino de Santiago in Spain.



Jim Histand served as the first President of Tremble Clefs Arizona (2018-2019) after shepherding the merger of the West Side Tremble Clefs and the Original Tremble Clefs to form Tremble Clefs Arizona and lead the organization’s successful application for official 501(c)(3) status. Jim also serves as President of West Side Tremble Clefs (2016-current), having served since 2015 as a Steering Committee member. Jim  volunteers as Corporate Treasurer and CFO of Crossroad Baptist Church of Arizona, Litchfield Park, and served five years as Treasurer of Westpointe Baptist Church, Goodyear, and five years as a Director and Treasurer of the Sierra Montana Homeowner’s Association, Surprise, Arizona. 

He is a former U.S. Air Force Captain having been stationed at Luke AFB, AZ; Bolling AFB, DC, and with the Air Staff at the Pentagon. Jim earned a Bachelor of Science Degree in Mathematics from Bob Jones University and a Master of Science Degree in Computer Science from New Mexico State University. He moved to Arizona when he retired after 35 years as Minister of Finance, Fairfax Baptist Temple, Fairfax, Virginia, where he was ordained as a minister. Jim was diagnosed with Parkinson's disease in 2009. He has found great vocal benefits from participating in the West Side Tremble Clefs. Retired, he enjoys traveling, reading, ministering to the needs of others, singing, spending time with his family and ‘yarding.’



Dan Jilka received a Bachelor of Science in Electrical Engineering from Kansas State University and a Master of Science in Electrical Engineering from Iowa State University in 2002. His career experiences include Avionics Systems Engineer and Engineering Manager at Rockwell Collins; CFO and Partner at TekSci, an aerospace software company; and Partner and Engineering Recruiter at Management Recruiters, Seattle WA. Dan was diagnosed with Parkinson’s disease in 2016 and has been a member of the West Side Tremble Clefs ever since.  Dan looks forward to the weekly meetings and to sharing with other people who have Parkinson's and their families. Tremble Clefs - Director Sun Joo and the people in the choir - are instrumental in helping him combat the effects of PD in his every day life.




Sun Joo Lee was born in Seoul Korea and has an undergraduate degree in Voice Performance from SungShin Women’s University in Seoul. She moved to Arizona in 2003 and received her Maser’s degrees in Music Therapy and Voice Performance from Arizona State University in 2008. Upon graduation Ms. Lee was approached by the Muhammad Ali Parkinson Center in Phoenix to establish a singing group for people with Parkinson’s disease in the Sun City area. She is director of the group which is now the West Side Tremble Clefs. Later that same year, she accepted the position as Music Director of the Original Tremble Clefs, a choral group for people with Parkinson’s founded in Scottsdale in 1994.

Sun Joo Lee works as a Board-Certified Music Therapist (MT-BC) and is certified as a Neurologic Music Therapist Fellow. As owner and clinical director of Sunshine Music Therapy, LLC, Ms. Lee’s work focuses on neurological diseases, such as strokes, dementia, PD and Alzheimer’s. She is a pre-clinical supervisor at Arizona State University and enjoys teaching others to become music therapists. As the Music Director Ms. Lee is an ex-officio member of the Board of Tremble Clefs Arizona.



Mina DeWitt holds a Bachelor of Music degree with a major in vocal studies and a minor in piano from Grand Valley State University, Grand Rapids, Michigan. Her Master’s work was in vocal studies and choral direction from Michigan State University in Lansing, MI and Western Michigan University in Kalamazoo, MI. In Michigan, she taught piano, organ, voice and theory at the collegiate level. She was the accompanist for the Rapid City Dakota Choral Union and a nine voice group called Bella Voce. She was Minister of Worship and Music at two churches and involved in musical theater. Mina DeWitt moved to Sun City, AZ in June 2014. She has always had an acute interest in music therapy. She and her husband Dale have three children and seven grandchildren. Mina is deeply honored to be a contributing partner as the accompanist for the West Side Tremble Clefs.



Mutsumi Mori holds bachelor's degrees in Choral Music Education and Piano Performance from Northern Arizona University, Flagstaff. She received her master's degree in Collaborative Piano and Vocal Coaching from the University of Minnesota where she studied with the renowned vocal coach and collaborative pianist, Margo Garrett. Besides being the accompanist with the Original Tremble Clefs, Scottsdale, she is the pianist for Sonoran Desert Chorale and other choirs and instrumentalists. Ms. Mori is also organist/pianist fro St. Matthew's Episcopal Church in Chandler.



Mutsumi Mori holds bachelor’s degrees in Choral Music Education and Piano Performance from Northern