District Leadership Team

Dr. Tatiana Bonuma

Superintendent

Dr. Bonuma was named superintendent in 2024 following her five year service as the Deputy Superintendent in Leyden School District 212.

She served as Principal of West Leyden High School from 2015 through 2019.

Prior to arriving in Leyden School District 212, she served as Associate Principal of Student Services at Grayslake North Community High School during the 2006-07 school year. She was Dean of Students at York Community High School from 2004 until 2006 and served that same role at Larkin High School from 2003 to 2004. She was also the ELL/Bilingual Divisional Director at Larkin High School from 2000 to 2003. 

She began her teaching career in 1995 as a Spanish teacher at Larkin High School and became an ELL/bilingual teacher at Canton Middle School in 1997 and served in that role until 2000.

Dr. Bonuma earned her bachelor of arts degree from University of Dubuque with a triple major in Marketing, International Studies and Spanish. She earned her masters in Secondary Education with a Type 09 certificate in Spanish, Business and Social Studies from Roosevelt University. She earned her Ed.D. Educational Administration degree with a Superintendent Endorsement from Aurora University. 

Dr. Bonuma has earned a Chief School Business Official Endorsement, General Administrative Certificate and ESL/Bilingual Endorsements. She is fluent in both Portuguese and Spanish.

Superintendent’s Office Team Members and Contact Information

George Dagres

Assistant Superintendent of Human Resources

Mr. Dagres began his career in District 207 in 2002 as a Dean of Students at Maine South High School and served in that role until 2009.

In 2010, Mr. Dagres became the Associate Principal of Maine South High School and moved into his current position, Director of Human Resources with District 207 in 2020. 

Mr. Dagres started his education career in 1996 teaching Chemistry and Math at York High School in Elmhurst. In 1999, he became a Team Leader (Dean of Students) at Libertyville High School in Libertyville.  

Mr. Dagres holds a Bachelor of Science degree in the Teaching of Chemistry from the University of Illinois and a Master’s Degree in School Administration and Leadership from Lewis University. 

Human Resources Office Team Members and Contact Information

Kathleen Di Sanza

Assistant Superintendent for Student Services

Ms. Di Sanza joined District 207 in 2016 as the Department Chair for Special Education at Maine West, followed by her role as the Co-Director for Special Education and Coordinator of Private Placement.

Previously, she was the Assistant Director for Student Services and Director for Transition Services at Niles Township High School District 219 and served as a school psychologist at both Niles North High School and Community High School District 155.

Before starting her career in education, Ms. Di Sanza worked both in social services and recruiting. These endeavors led her to the field of education where she was able to pursue her passion of working towards equity in education for all students while preparing them for life post-secondary. 

Ms. Di Sanza holds a bachelor’s in Psychology from Western Illinois University and a master’s in Education and educational specialist degree in School Psychology from Loyola University Chicago. She received her Educational Leadership endorsement from Concordia University and holds a Director of Special Education endorsement.

Student Services Team Members and Contact Information

Mary Kalou

Assistant Superintendent for Business

Ms. Kalou has served as the Assistant Superintendent for Business/CSBO for District 207 since 2009. She has more than 20 years of experience as a school business official.

After spending several years at a large public accounting firm, Ms. Kalou began her school district career at District 207 in 1993, serving as the Director of Accounting.

She served in that capacity for five years. She also has served as an Assistant Superintendent for both Arlington Heights School District 25 and Lake Zurich School District 95.

In addition to being a certified public accountant, Ms. Kalou holds a bachelor’s degree from Loyola University, a master’s degree from Northern Illinois University, an education specialist degree from Northern Illinois University and earned her Chief School Business Official (CSBO) endorsement from Northern Illinois University.

Business Office Team Members and Contact Information

Dr. Shawn Messmer

Assistant Superintendent for Curriculum & Innovation

After starting a career in advertising following his bachelor’s degree, Dr. Messmer realized through his work as a basketball coach that his passion resided in helping young people reach their full potential and prepare for a successful school and work life.

Moving into the field of education, he taught middle school and high school before serving as an assistant principal for five years at Souderton Area High School in Pennsylvania, his home state. He earned a bachelor’s degree in history from Temple University, a master’s degree in educational leadership from Lehigh University and a doctorate in educational leadership from Concordia University of Chicago.

In 2010, Dr. Messmer became the principal of Maine South High School and moved into his current position with District 207 in 2017.

Curriculum Office Team Members and Contact Information

Brett Clark, APR

Director of Communications

Mr. Clark began his work in District 207 in 2018. He has more than 25 years of experience in both higher education and public K-12 schools.

He spent 13 years with Glenview School District 34 serving as Executive Director of Communications and Strategic Planning before becoming Executive Director of Human Resources during his time with the district.

Mr. Clark also has worked for Parkway School District and Ladue School District in Missouri. In the higher education sector, he worked for Millikin University and the University of Missouri-St. Louis.

Mr. Clark holds the Accredited in Public Relations (APR) certification from the Public Relations Society of America. He is a graduate of the University of Illinois with a bachelor’s degree in Journalism.

Communications Office Team Members and Contact Information