SAINT CATHERINE ACADEMY - Key Persons


Allison Siebert


Amy Beers


Barbara Kirwan


Bobby Green

Job Titles:
  • Facilities Manager

Brittany Ciarelli

Job Titles:
  • Science

Carlos Calderon

Job Titles:
  • Director of Athletics

Chris Tabaczynski

Job Titles:
  • Music

Claudia Sitto

Job Titles:
  • Guidance Counselor ( a - H )

Connie Shallal-Johnston

Job Titles:
  • Mathematics

Dan Bumpus

Job Titles:
  • Dean of Students

Diahann Sproule


Dr. Cheryl Mazzara

Job Titles:
  • Board Member / Psychiatrist at Renewal Christian Counseling Center
Dr. Mazzara has been practicing psychiatry for 27 years, working with adults and children, and currently has a private practice in St. Clair Shores. She has been married for 32 years and has two sons, aged 27 and 25, and a daughter named Karissa who graduated from St. Catherine of Siena Academy in 2017. She is an active board member for Haiti Africa Relief Team, a nonprofit organization based in Grosse Pointe which provides medical and humanitarian care in Jesus' name. Being such, she has been on several mission trips to Haiti, and is chair of the orphanage committee. Recently, she completed a master's degree in Theology at Sacred Heart Major Seminary with her thesis topic being "Truth in the Gospel of John: An Answer to the Mental Health Crisis in the US." She is committed to bringing the truth of the gospel, especially to young people, so they may be empowered to set the world ablaze.

Elaine Best

Job Titles:
  • Admissions Associate
Fun facts: Elaine loaves to explore new coffee shops. Her favorite authors are CS Lewis and JRR Tolkien and she enjoys trying new recipes!

Esther Mendez


Giacomo di Benincasa

Job Titles:
  • Caterina Di
Caterina di Giacomo di Benincasa was born on the feast of the Annunciation, March 25th, 1347, in the Fontebranda district of Siena, Italy, the twenty-fourth of twenty-five children. Her father was a dyer and her mother was the daughter of a local poet. Catherine was known as an imaginative, idealistic, and outgoing child who was fiercely independent. She began to have personal revelations early in her childhood. Catherine consecrated her virginity to Christ at the age of seven and began wearing the Dominican Tertiary's habit at the age of sixteen, taking the Vows of Poverty, Chastity, and Obedience.

Greg Nickel

Job Titles:
  • Mathematics

Hutham Tankersley

Job Titles:
  • Guidance Counselor ( I - Z )

Jacki Green

Job Titles:
  • Director of Culinary Services

Jamie Bohl

Job Titles:
  • Enrollment Registrar

Jennifer Zbytowski

Ms. Zbytowski is a fiction author with three books published under my pen names.

Jill Kara


Judith Hehs

Job Titles:
  • Principal

Julie Czopek

Job Titles:
  • Health / Read Bio

Julie Rzepka

Job Titles:
  • Learning Specialist

Kathy Isgro

Job Titles:
  • Business Manager

Katie Brandt

Job Titles:
  • Science

Keith Shafer


Lucia Eisner-Smerage

Job Titles:
  • Science

Marissa DeJager


Michael Hegarty

Mr Hegarty has sailed in both the Port Huron and Chicago to Mackinac Island sailboat races.

Molly Rose Powers

Job Titles:
  • 1 Year in Education / Enjoyed Student Teaching at SCA for the 2022 - 23 Academic Year
  • Latin, Theology

Mr. Jeffrey Ritz

Job Titles:
  • Board Treasurer / Chief Financial Officer at Fives Machining Systems Inc
  • Experience Chief Financial Officer ( CFO )
Mr. Jeffrey Ritz is an experience Chief Financial Officer (CFO) with a demonstrated success of working in the machinery industry. Skilled in budgeting, project accounting, and corporate finance, he is a strong finance professional who brings a wealth expertise to the St. Catherine Board.

Mr. Paul Kueber

Job Titles:
  • Board Chair / Retired
Mr. Kueber worked at Ford Motor Company for 31 years where he was responsible for forward model vehicle programs. He retired in 2020. Mr. Kueber grew up in Dearborn, MI, attended Catholic Central High School , and received a BS from the University of Notre Dame. He then continued on to earn a MS from University of Michigan. Mr. Kueber is married to Dawn with three children (Noah, Grace (SCA Class 2017), Lily (SCA Class of 2021). He also was the first SCA Parent Club President from 2015 thru 2019. Mr. Kueber is also active in the Knights of Columbus, serving as Deputy Grand Knight at OLV Northville.

Mrs. Janet Duff

Job Titles:
  • Member of the Board
After 35 Years Janet retired from Ford Motor Company in 1997 as a Benefit Representative. She was instrumental in putting together, along with seven other Benefit Representatives, a Centralized Benefit Center in Dearborn for Ford Motor Company. Her son John Duff graduated from Dearborn Divine Child High School and was offered a 4 year scholarship to Michigan Tech., Houghton, Mi. John donated "John the Baptist Relic" that sits near the SCA altar. She is currently a parishioner of Holy Spirit Roman Catholic Church, Brighton, Mi. Her involvement there has been in many church fundraisers involving silent auctions and was a member of the Parish Council. She instigated the "Come Dine with Jesus" table located on the grounds at Holy Spirit which found a place on the Michigan's Roadside Attractions list. She started a group with the help of her Financial Adviser called "Women In The Know", a group that meets quarterly with a local speaker. This was organized to educate women on Finances, Healthcare, Trusts, Wills, Scams, Real Estate Home selling, etc. She also served 10 years as condo President for Country Club Village III, Northville, Mi.

Mrs. Lia Johnston - President

Job Titles:
  • President
  • Ex Officio Member / President of St. Catherine of Siena Academy
Mrs. Johnston received a Bachelor of Science in Mechanical Engineering from the University of Utah and a Master of Business Administration from Ashland University. After spending 19 years working for Ford, Visteon, and the Automotive Components Holdings, she left the automotive industry to spend time with her two young daughters. Ready to rejoin the workforce, she joined St. Catherine of Siena Academy in 2009 as the Marketing Director. Over the past 11 years, she has worked with admissions, the business office, and advancement learning the ins and outs of the school administration. Mrs. Johnston is married with two daughters. Her daughters graduated from St. Catherine in 2018 and 2021.

Mrs. Teresa Grumm - Chief Legal Officer

Job Titles:
  • Corporate Counsel
  • Board Secretary / Corporate Counsel, Stryker Sales Corporation
Ms. Grumm is an accomplished corporate counsel with extensive expertise in healthcare for various transactional matters (U.S. and international). She provides counsel for global corporations serving commercial clients, federal government, nonprofit and group purchasing organizations. As a skilled communicator that mitigates risk, she shares her wisdom with the SCA Board.

Msgr. Timothy Hogan

Job Titles:
  • Board Member / Pastor at St. Fabian Catholic Church
Monsignor Hogan received his BA from Allentown College of St. Francis de Sales, Center Valley, Pennsylvania (now DeSales University), a Master of Divinity from St. John Provincial Seminary, Plymouth, Michigan, and ordained a priest on December 11, 1982. He has served as parochial vicar at Shrine of the Little Flower in Royal Oak, Michigan, Our Lady of Good Counsel in Plymouth, Michigan, and Sacred Heart Parish in Dearborn, Michigan. His pastoral positions have included working at St. Christopher Church in Detroit, Church of the Holy Family in Novi, Michigan, and currently at St. Fabian Catholic Church in Farmington Hills, Michigan. Msgr. Hogan has also served as Vicar for Clergy and Consecrated Life for the Archdiocese of Detroit. While in the navy, he was assigned to Florida, Virginia, North Carolina, Naples, Italy, Okinawa, Japan, and six at-sea deployments, including Afghanistan on board the USS Bataan LHD5. He also served two combat deployments to Iraq with the US Marines. Msgr. Hogan retired from the US Navy with 30 years of service as Hospital Corpsman then later as a Chaplain.

Nicole Schultz

Job Titles:
  • Culinary Services

Orrin Tibbits

Job Titles:
  • 17 Years in Education / 7 Years at SCA Teaching Social Studies
  • Social Studies

Pam Burke

Job Titles:
  • Administrative Assistant

Paul Davidson

Job Titles:
  • Mathematics

Rev. Michael G. Savickas

Job Titles:
  • Board Member / Pastor of St. William Parish in the Diocese of Detroit
Father Savickas was ordained a priest December 6, 1974, and all of his priestly assignments have been at parishes with schools. He served as an active member of the Archdiocesan "Catholic Schools in the Future Committee" from 2007 through 2010, and then on the "Catholic School Advisory Board" from 2010 through 2013. Assigned as pastor to St. William Parish in Walled Lake since 1985, he has striven to incorporate their school program as an intrinsic element of the parish. He strongly endorses the Archbishop's statement in Unleash the Gospel that, "Catholic Schools are an apostolate that is the responsibility of all parishes and all Christ's faithful." St. William School is recognized in the Archdiocese for its leadership in creating a program to serve children with special needs. Also, it is the first school in this Archdiocese to establish an Administrative Oversight Board, a concept which is hoped to aid schools that are struggling with changing demographics and declining enrollment. Fr. Savickas is excited that, with the aid of this dedicated group, the decision has been made to expand the school to include programs for 3 and 4-year-old children. Above all, he recognizes that the mission of all Catholic Schools is to help our children encounter Christ and to be nurtured as disciples, while striving for academic excellence.

Samantha Wakefield


Sr. Mary Ann Foggin

Job Titles:
  • Campus Minister
Before joining religious life, Sr. Mary Ann worked in advertising in Atlanta, GA.

Tiffany Tatman

Job Titles:
  • Director of Admissions