Community Consolidated School District 181

Since 1953, Oak Elementary School has been a cornerstone of the Hinsdale community and is proud to be a U.S. Department of Education Blue Ribbon School. Oak School is comprised of caring and talented students, excellent staff, and incredibly supportive families. It has earned a reputation for academic excellence and for supporting all students in their social-emotional learning. Oak also has the unique opportunity to house the Neighborhood Preschool Program which brings together the youngest learners from across the District. We are committed to preparing all our students to become lifelong learners, creative thinkers, and positive community contributors.

A Message from Principal Nassis

I am honored to introduce myself as Oak School’s principal! I have over fourteen years of various teaching and leadership experiences in the field of education. Previously to joining District 181, I served Naperville School District 203 as an Elementary Assistant Principal, and Elmhurst School District 205 as an instructional coach, building literacy specialist, classroom teacher, and a leader of ongoing professional learning. I hold a Bachelor’s Degree in Elementary Education, a Master’s Degree in Reading Education, and a second Master’s Degree in School Improvement Leadership.

I continuously strive to be an active instructional building leader who understands school systems, leading transformative change, curriculum design and implementation, and increasing teacher capacity to elevate student learning. I believe that every child has the potential to learn and grow and impact our world in a positive and lasting way. At Oak School, I am confident that we will successfully accomplish District 181’s vision to help students develop the skills and confidence they need to change the world. I am proud to proclaim, “We are Oak School!”

Please do not hesitate to contact me about partnering together in the pursuit for every child to be seen, valued, and continuously supported in their lifelong learning and growing.

Effey Nassis

Oak School Events

Oak School Administration Team

Principal, Oak School

Effey Nassis

Pupil Services Administrator
Megan Byrne


Oak Building Admin. Assistant
Stephanie Konieczka

ECE Building Admin. Assistant
Marianne Freza

Contact Info

Address: 950 S Oak St, Hinsdale, IL 60521
Phone: (630) 861-4300
Fax: (630) 861-4352

School Hours

  • Pre-K (am):
    8:25am - 10:55am
  • Pre-K (pm):
    12:15pm - 2:45pm
  • KG (am):
  • KG (pm):
    12:20pm - 3:05pm
  • Grade 1-5:
    8:40am - 3:05pm
  • Lunch:
    11:25am - 12:15pm

Oak Elementary School Quicklinks

D181 Handbook

District 181 Student Handbook

The District 181 handbook (Elementary Handbook and Middle School Handbook) provides useful information about District 181’s policies, procedures, resources, and expectations for students. Please take some time to review the handbook with your child(ren) and reference it throughout the year.