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Welcome to Althoff Catholic High School! Established in 1964, Althoff has built a great tradition of developing the talents and passions of our students in a small, family-like environment. We work to develop the body, mind, and soul of the whole child.

Our hope is that by developing a rigorous curriculum, it will serve as the foundation of a lifelong passion for learning. Our goal is to challenge students to make meaning of what they are learning and to guide them to become self-advocating problem solvers. We do so by using researched-based instructional strategies to empower students to take charge of their own learning and encourage them to ask the tough questions that lead to deep understanding.

We are called by Jesus Christ to educate students, in the Catholic tradition, to lead successful, faith-filled lives and aspire to achieve their personal best in all they do. 

Our entire school of faculty, students, administrators, trustees, parents, and alumni work together to ensure that Althoff is a flourishing community, diverse in perspectives and backgrounds.

We invite you to visit our campus and see for yourself what makes Althoff Catholic so special.

Leadership Team
Dr. Sarah Gass - Principal

It is my pleasure and honor to serve as Principal of Althoff Catholic High School. 

This is the start of my sixteenth year in education.  My career began at O’Fallon Township High School District as a mathematics teacher. I then had the opportunity to serve as the Principal of Chester High School and Assistant Principal of Curriculum and Instruction at Quincy Senior High School.

My husband Chris and I have been married for fifteen years and have three kids. Our family loves to go outside to camp, swim, and waterski.

As Principal of Althoff, I am dedicated to our students’ successes and will strive to continue the positive relationships, rigorous learning, and positive culture that encourages our students to celebrate their unique strengths. I view education as a lifelong process. Most importantly, I bring a belief that the students are at the center of all school-related decisions.  

I am excited to bring my experience and my child-centered approach to support our students.  

Pamela M. Schumacher - Vice Principal
  • Curriculum, Instruction, and Technology

I am happy to be a part of the Althoff family for the past 24 years and to serve as a Vice-Principal.

I have been a Catholic school educator for over 35 years and started my career at S.S. Peter & Paul School in Collinsville teaching English at the junior high level. I then had the opportunity to teach junior high at Queen of Peace School in Belleville before becoming employed at Althoff Catholic as an English Teacher and Technology Coordinator.

My husband, David, and I are both graduates of Althoff as well as each of our siblings, our 2 daughters, and our 8 nieces and nephews.

As a Catholic educator, I look to the education of the whole student. If we support a student’s faith, social and emotional development, then academic development will flourish.

The joy in teaching is seeing the successes that students experience in many different ways.

Greg Leib - Assistant Principal
  • Student Services, Discipline, and Substitute Teachers

I’ve been blessed to be part of Althoff Catholic High School for 24 years. 

I’ve been in education for 32 years. My career began at Roxana Jr/Senior High School as a math teacher, health teacher, physical education teacher, and a social studies teacher.  I’ve been in administration for 22 years. 

My wife Tammy and I have been married for twenty-five years and we have three kids. Our kids all attend Althoff and we are very involved in their extracurricular activities.

As Assistant Principal of Althoff, my goal is to build better young adults. I believe kids don’t care how much you know until they know how much you care.  Relationship building is a primary focus in helping us achieve our aforementioned goals.

I believe Althoff Catholic High School to be a special place where dreams can be achieved. 

Local Catholic Elementary Schools

Address: 8809 West Main Street, Belleville


Phone: (618) 397 1111

Address: 215 North John Street, Mascoutah


Phone: (618) 566 2922

Address: 504 Fountains Parkway, Fairview Heights


Phone: (618) 628 7395

Address: 200 South 2nd Street, Belleville


Phone: (618) 233 6414

Our Lady Queen of Peace Grade School
Belleville, Grade School
Phone: 618-234-1206Our Lady Queen of Peace Grade School
Belleville, Grade School
Phone: 618-234-1206Our Lady Queen of Peace Grade School
Belleville, Grade School
Phone: 618-234-1206Phone: 618-234-1206

Address: 5915 North Belt West, Belleville


Phone: (618) 234 1206

Address: 8213 Church Lane, East St. Louis


Phone: (618) 397 0316

Address: 214 West 3rd Street, O'Fallon


Phone: (618) 632 6327

Address: 412 West Washington, Millstadt


Phone: (618) 476 3510

Address: 10 South Lincoln, Smithton


Phone: (618) 233 0581

Address: Freeburg


Phone: (618) 539 3930

Address: 1108 Lebanon Avenue, Belleville


Phone: (618) 235 4066

  • Don't miss our Fall Open House on Sunday, October 16. This event is designed for 6-8 graders as well as transfer students to tour our facilities, meet with our teacher and students, and get your questions answered! Make sure to RSVP online. We look forward to seeing you there!

  • We accept transfer students throughout the school year. Freshman application for 2023-24 will open on October 1. Make sure to submit your application now!
  • See how you can become part of our volunteer community & get involved with different groups & projects!
  • Brittany McDonald and her classmates never knew the old second floor library at Althoff Catholic. The STREAM (Science, Technology, Religion, Engineering, Arts, Mathematics) Lab was up and running when they entered as freshmen. With natural talents and a passion for science and mathematics, Brittany wasted no time taking advantage of all that the school’s new Biomedical Science program had to offer.

    The nationally recognized Project Lead the Way (PLTW) curriculum taught at Althoff has shaped Brittany’s goals for the future by igniting her passion for the medical field. “These classes have opened my eyes to the many career choices in the medical field by giving me hands-on experience with some of the things I would have to do in that specific career path,” said Brittany.

    One of the most valuable lessons Brittany has learned in her PLTW classes is that there are many ways to approach a problem and that analyzing things from all sides is important. Brittany has taken Principles of Biomedical Sciences, Honors Human Body Systems, and Honors Medical Interventions in the STREAM Lab. She has enjoyed having Mrs. Leutkenhaus as a teacher and all the hands-on experiences that these classes offer.

    “Brittany is an amazing student who has worked tirelessly throughout her four years at Althoff. She has been so dedicated to the Biomedical STREAM program that she has willingly taken on the third-year course as an independent study because it did not fit into her schedule,” said Mrs. Angie Leutkenhaus. “Despite the fact that she does not hear the content presented in class, she reads through the material and perseveres through the laboratory work on her own. I am confident that her determination speaks volumes of her academic potential and success beyond high school.”

    In addition to the STREAM program, Brittany credits her work in Advanced Chemistry, Advanced Biology, Calculus, and Statistics as helping to prepare her for the classes she will take in her Chemistry Pre-Pharmacy program at Xavier University of Louisiana where she was admitted with a scholarship.

    Brittany and her family chose Althoff Catholic because they knew it would be a place that would feed her academically and spiritually, building on the strong foundation she received at Blessed Sacrament Grade School.

    Outside of the classroom, Brittany has enjoyed being part of Math Team, Varsity Cheer, National Honor Society, Rotary Club, and Saturday Scholars. Brittany has also served as an ACE Leader, a math tutor, and is a member of Delta GEMS.

    “What I enjoy most about Althoff is the people because we are like a family. No one is left out or feels unwanted,” said Brittany. “Althoff finds a way to make every single person feel included.”

    Your support of the Catch the Crusader Spirit Virtual Gala helps make the Althoff Catholic experience possible for amazing students like Brittany. Fundraisers like the gala are vital in supporting our curriculum improvements, facilities, professional development for teachers, tuition assistance, and more.

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