Dr. Mary Henderson (@lead_learner12) header
Dr. Mary Henderson (@lead_learner12) profile picture

Superintendent of Roselle School District 12

Elmhurst, IL
Joined August 2016
Photo by Dr. Mary Henderson (@lead_learner12)Photo by Dr. Mary Henderson (@lead_learner12)Photo by Dr. Mary Henderson (@lead_learner12)Photo by Dr. Mary Henderson (@lead_learner12)Photo by Dr. Mary Henderson (@lead_learner12)Photo by Dr. Mary Henderson (@lead_learner12)Photo by Dr. Mary Henderson (@lead_learner12)Photo by Dr. Mary Henderson (@lead_learner12)Photo by Dr. Mary Henderson (@lead_learner12)Photo by Dr. Mary Henderson (@lead_learner12)
Dr. Mary Henderson retweeted
Replying to @gcouros
@gcouros crushing the keynote at our annual conference. #IASA2026 @IllinoisASA #forwardtogether
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Dr. Mary Henderson retweeted
We are excited to welcome our four new staff members into our Roselle District 12 community! #YouBelongInD12
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Dr. Mary Henderson retweeted
Congrats to Jennifer Kelsall, Illinois superintendent running for AASA president! Voting is now open! Show your support for our friend and colleague Jen who is doing this hard work every day for Kids!!! #leadership
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Let’s go Jen!
GO JEN GO!!! Please make sure you vote when it's released! You can learn from both candidates this week at the conference.
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Dr. Mary Henderson retweeted
First competition of the season for our Roselle Middle School eSports team! Go Ravens! #YouBelongInD12
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Thank you to our Roselle learning community for everyone's hard work!
Congratulations to Roselle D12's Spring Hills School! #YouBelongInD12
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We are so proud of our learning community and the hard work of our staff and learners!
Congratulations to Roselle Middle School!! #YouBelongInD12
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Ending Week 1 in the best possible way…8th graders walking over to welcome our kindergarten learners and gifting them their first spirit wear, hard to tell which group loved it more! #YouBelongInD12
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Dr. Mary Henderson retweeted
Mr. Rogers taught us that curiosity opens the door to understanding. Our support teams at Spring Hills are ready to guide students on that journey. #YouBelongInD12
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The admin team arrived in the neighborhood in time to welcome back our amazing staff. We are ready to “Engage, Explore, and Wonder Together!” YouBelongInD12
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We can’t wait to welcome our staff tomorrow morning. New year, same vision and purpose fueled by incredible people! #YouBelongInD12
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Dr. Mary Henderson retweeted
What a way to end our summer PD series with a Building Thinking Classrooms workshop presented by our own teacher trainers! #YouBelongInD12!
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It’s been quite a week for our family. Harrison Francis Salsinger arrived three weeks early on July 20. From a few days in the NICU to now adjusting to life at home, he is already so loved. My family continues to grow in the sweetest of ways!
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Dr. Mary Henderson retweeted
What separates good teaching from great teaching? Effective feedback. Hattie’s research tells us that feedback has an effect size of 0.70—almost double the average. But not all feedback is equal. According to Hattie, “The most powerful single influence on achievement is feedback…but it must be timely, specific, and help the learner know where to go next.” Dylan Wiliam expands on this with his five strategies for formative assessment. He reminds us that feedback should cause thinking, not compliance. If students are not using feedback to move their learning forward, it’s just noise. Susan Brookhart emphasizes that feedback must be clear, purposeful, and aligned with the learning target. Vague praise or criticism does little. Students need to understand what they’re doing well, where they need to improve, and exactly how to do it. Grant Wiggins said, “Feedback is not advice, evaluation, or judgment. It’s information about how we’re doing in our efforts to reach a goal.” In short—feedback should not end the learning—it should ignite it. And let’s not forget Carol Dweck, who teaches us that how we frame feedback impacts whether students develop a fixed or growth mindset. If we want students to persist through challenges, our feedback must reinforce the process, not just the person. So in your classroom: •Make learning goals clear •Give feedback during the learning, not after •Use student work and peer feedback to promote ownership •Keep the focus on progress and next steps Great classrooms are built on a culture of feedback—where students don’t just hear it, they act on it. @VisibleLearning @dylanwiliam @SusanBrookhart @CarolDweckDSU
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Dr. Mary Henderson retweeted
Congratulations to our 2025 8th-grade graduates! We are proud of you and know you will go on to great things! #YouBelongInD12
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Barb is an inspiring leader...proud to be her colleague!
Congratulations to Barb Thompson on being named an IASA Superintendent of Distinction in the Illini Region. Barb has been superintendent of Fisher CUSD 1 for 20 years. #ILSuptsRock tinyurl.com/4pahfchy
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Carrie is an amazing leader!
Congratulations to Dr. Carrie Hruby on being named an IASA Superintendent of Distinction in the Southwestern Region. Dr. Hruby has been superintendent of O'Fallon CCSD 90 for 10 years. #ILSuptsRock tinyurl.com/56de2uy8
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DuPage County superintendents are fortunate to have Dr. Schuler as a trusted and valued colleague!
Congratulations to Dr. Jeff Schuler on being named an IASA Superintendent of Distinction in the DuPage Region. Dr. Schuler has been superintendent of CUSD 200 for 11 years. #ILSuptsRock tinyurl.com/bdcex3wc
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Leadership demands strong decision-making. Executive coaching enhances critical thinking, helping leaders navigate complex challenges with clarity and confidence. The right choices start with the right mindset. #LeadWithGrowth
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In today’s unpredictable world, leaders need resilience more than ever. Executive coaching provides the skills to manage change, handle stress, and thrive in uncertainty. Are you prepared for the next challenge? #LeadWithGrowth
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