BILL FIORDALIS - HEAD OF SCHOOL
Bill Fiordalis was appointed Head of School and officially began on July 1, 2025. Mr. Fiordalis grew up in Cleveland, Ohio, and upon graduating from high school, attended Rollins College in Winter Park, Florida. After graduating from Rollins, he earned his Master's in Education from Ursuline College in Pepper Pike, Ohio, and served as a classroom teacher for 15 years, teaching 4th and 6th grade.
Before joining St. Mark’s Episcopal School, Mr. Fiordalis spent twenty years at Lake Highland Preparatory School in Orlando, Florida, where he served in several teaching positions and administrative roles, including Director of Lower School and Associate Head of School.
DR. ALEXANDRA FERNANDEZ - HEAD OF LOWER SCHOOL
Alexandra Fernandez was appointed as Head of Lower School in July 2022. For the past 24 years, Dr. Fernandez has served as a teacher and administrator in PK through Grade 8 schools. Prior to joining St. Mark’s, Dr. Fernandez served as Principal for two schools in the Archdiocese of Miami, where she held various leadership roles as a principal advisory council member, principal mentor, and clinical educator. Additionally, Dr. Fernandez has served on numerous accreditation visits as a team chairperson for the Florida Catholic Conference Accreditation Program. Dr. Fernandez holds a Doctor of Education degree in Leadership from Creighton University, a Master of Science degree in Educational Leadership from Nova Southeastern University, a Bachelor of Science degree in Secondary English Education from Nova Southeastern University, and a Professional Educator's Certificate in Educational Leadership and English Education from the State of Florida. With extensive experience and a deep passion for education and leadership, Dr. Fernandez also serves as a Leadership Coach for FACTS Education Solutions.
MARCO CIRILLO - HEAD OF MIDDLE SCHOOL
Marco Cirillo was appointed Head of Middle School in July 2023. He brings with him over 19 years of UK and international school experience. Holding various teaching and administrative roles throughout his career, Mr. Cirillo has extensive experience in both designing and publishing curricula for leading international organizations, being part of accreditation teams and leading regional professional development programs. Mr. Cirillo holds a Bachelor of Arts degree in Geography and Development Studies from the University of Sussex and a MA in Secondary Education from Middlesex University.
CATHY HOFFNER - HEAD OF PRESCHOOL
Catherine Hoffner was appointed Head of Preschool in June 2024. For the past twenty years, Ms. Hoffner has served as a teacher in fifth grade, second grade, pre-K4 and Christian Education. She has been a member of the St. Mark’s faculty for the past 14 years. Additionally, Ms. Hoffner is a United States Navy veteran, serving 4 years active duty and 17 in the reserves. Ms. Hoffner holds a Bachelor of Arts degree in Elementary Education, DCF Director’s Credential and a Professional Educator’s Certificate from the State of Florida in Elementary Education and Prekindergarten with an ESOL Endorsement. Ms. Hoffner is the proud mom of a former St. Mark’s student, who will be attending Florida Atlantic University in the fall of 2024.
SERGIO PEREZ - CHIEF FINANCIAL OFFICER
Sergio Perez was appointed Chief Financial Officer in May of 2024 after 16 years at North Broward Preparatory School, last serving as the Director of Finance. Mr. Perez, a graduate of Florida Atlantic University and Certified Public Accountant, has a 30+ year career in which he held accounting and finance positions in various industries, such as Food Retail, B2B Retail, and Semiconductor, prior to joining North Broward Preparatory School. After a brief stint in an accounting leadership position in the Insurance industry, Mr. Perez returned to his passion which is being part of the education community. Mr. Perez and his wife, Maritza, are the parents of five children: three sons, Luis, Christian and Christopher, and two daughters, Adrianna and Alyssa.
CINDY SEXTON - DIRECTOR OF ENROLLMENT
Cindy Sexton was appointed Director of Enrollment in April 2015. Entering her 23rd year in education, Ms. Sexton has considerable college and independent school experience in recruitment, admission, enrollment, and retention. She holds a master’s and bachelor’s degree in Communication from the University of Arkansas. Additionally, Ms. Sexton is a Certified Admission and Enrollment Professional (CAEP©), and she has served on several school accreditation teams for the Florida Council of Independent Schools. Prior to joining St. Mark’s Episcopal School, she managed enrollment at Holy Spirit Preparatory School, an independent school in Atlanta, Georgia. Ms. Sexton is the proud parent of John, a St. Mark's alumni.
JILLIAN CROWLEY - DIRECTOR OF DEVELOPMENT
Jillian Crowley was appointed Director of Development in July 2024. Jillian has served at various levels of school administration for 18 years, including registrar, accounting, office management, assistant director, and admission and enrollment. Jillian’s passion lies in forming strong and lasting relationships with new families entering the school community and continuing by their side throughout their educational journey. A native Floridian born in Palm Beach Gardens, Jillian graduated with her Bachelor’s degree in Political Science from Florida Atlantic University. In her free time, she enjoys spending time with her large family, including her two children, Jack and Nora, who both attend St. Mark’s Episcopal School.