Dr. Jonathan R. Hallmark is the principal of Highland Middle School in Libertyville, Illinois. In his role as principal, he has mentored 11 assistant principals and has provided coaching and mentoring to many others through the Illinois Principals Association. He also serves as an adjunct professor in the Principal Preparation Program at Concordia University Chicago. Connect with him at [email protected]
If we want stronger schools and a healthy leadership pipeline, we must intentionally develop each assistant principal.

From Bulk Bookstore
How district leaders select, implement, and scale book-based professional learning
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From LINQ
Districts often overlook the hidden costs of cash, checks, and disconnected payment tools, from staff time spent processing payments to lost revenue and limited financial visibility. This whitepaper reveals where manual payment processes drain budgets, why families increasingly prefer digital payments, and how a unified K-12 payment platform can reduce administrative burden, improve reconciliation, and help districts retain more revenue.
Download Resource
From Pearson Education
Explore practical, age-appropriate strategies for introducing career awareness and exploration before students begin making high-stakes decisions about courses and pathways.�
Download Resource
From Cognia
To understand the impact in investing in principal readiness--we?ve created an infographic that connects research to outcomes.
Download Resource
From Diligent
This new eBook explores how data-driven auditing is helping districts modernize audit operations and strengthen fraud, waste and abuse efforts.
Download Resource
From Staples
This short article from Staples Business explores a familiar challenge in K-12 procurement: Why everyday school purchases don?t always flow through the cooperative contracts you already have in place.
Download Resource
From Bulk Bookstore
How district leaders select, implement, and scale book-based professional learning
Download Resource
From LINQ
Districts often overlook the hidden costs of cash, checks, and disconnected payment tools, from staff time spent processing payments to lost revenue and limited financial visibility. This whitepaper reveals where manual payment processes drain budgets, why families increasingly prefer digital payments, and how a unified K-12 payment platform can reduce administrative burden, improve reconciliation, and help districts retain more revenue.
Download Resource
From Pearson Education
Explore practical, age-appropriate strategies for introducing career awareness and exploration before students begin making high-stakes decisions about courses and pathways.�
Download Resource
From Cognia
To understand the impact in investing in principal readiness--we?ve created an infographic that connects research to outcomes.
Download Resource
From Diligent
This new eBook explores how data-driven auditing is helping districts modernize audit operations and strengthen fraud, waste and abuse efforts.
Download Resource
From Staples
This short article from Staples Business explores a familiar challenge in K-12 procurement: Why everyday school purchases don?t always flow through the cooperative contracts you already have in place.
Download Resource
From Bulk Bookstore
How district leaders select, implement, and scale book-based professional learning
Download Resource

