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About

Careers at Mullen

Teaching & Faculty Positions

List of 5 items.

  • Chief Development Officer

    Job Opening 2025-2026 School Year
    Chief Development Officer

    Mullen High School seeks to hire an energetic, committed individual to serve as Chief Development Officer. This is a full-time, at-will opening for the 2025- 2026 School Year.

    Position Overview

    Mullen High School, a Lasallian Catholic college preparatory high school in Denver, Colorado, seeks a seasoned development leader experienced in the Denver philanthropic market. The Chief Development Officer (CDO) is a key leadership position responsible for overseeing the school's strategic direction and management of all development-related activities. This includes fundraising, alumni relations, and donor cultivation. Candidates will have a track record of success in orchestrating annual and capital campaigns. In addition, they will understand effective school fundraising practices and how to engage individual and family donors, foundations, and corporations. The CDO will work closely with the President & CEO, the Board of Trustees, the Chief Financial Officer, and the Executive Leadership Team to ensure a robust, sustainable funding model supports the school’s Lasallian mission.

    CLICK HERE to view the Full Job Description
    This is a full-time position for the 2025-2026 school year.
    Salary Range: $100,000-$120,000
    depending on experience, education, and background

    Mullen reserves the right to pay more or less than the posted range and to interview only candidates who meet the job requirements and qualifications.

    Mullen offers a competitive benefits package to include health insurance and partially paid dependent premiums, an employer-paid defined benefit retirement plan, employer 403(B) contribution and employer partial match, employer-paid life and disability insurance, a cafeteria plan, and generous paid time off.

  • English Teacher (2025-2026 School Year)

    Job Opening Full-Time English Teacher

    Mullen High School is seeking to hire an energetic committed individual to serve as an English Teacher. This is a full-time opening for the 2025-2026 School Year.

    Position Overview
    Mullen High School is seeking to hire a faith-filled, energetic, committed English teacher to teach classes potentially including covering literary genres and periods, grammar and writing, literary analysis, and/or other topics. The applicant would be expected to plan, organize, and implement an appropriate instructional program in a learning environment that guides and encourages students to develop and fulfill their academic potential. The applicant must be able to plan, prepare and deliver instructional activities that facilitate active learning experiences, and establish, and communicate clear objectives for all learning activities. The ideal candidate will be an integral member of Mullen’s English Department and embrace the opportunity to be a role model to students not only in their academic development but also in their faith and personal development as well. As Lasallian and Catholic educators, we work to inspire our students academically, spiritually, and emotionally equally and anticipate that teachers who wish to join our staff look forward to this critical part of our work. 

    CLICK HERE for the Full Job Description
    This is a full-time, at-will position for the 2025-2026 school year. Compensation from $45,000- $75,000
    depending on years of experience and education.
    Mullen reserves the right to pay more or less than the range.

    Mullen offers a competitive benefits package that includes health insurance and partially paid dependent premiums, an employer-paid defined benefit retirement plan, an employer 403(b) contribution and partial match, employer-paid life and disability insurance, a cafeteria plan, and generous paid time off.

    Application Deadline: Friday, Feb 28, 2025
    Interviews will begin for qualified applicants as soon as materials are received
    Submit a cover letter, resume, & three references to HR@51rkb.com

  • Science Teacher (2025-2026 School Year)

    Job Opening Full-Time Science Teacher

    Mullen High School is seeking to hire an energetic committed individual to serve as a Science Teacher. This is a full-time opening for the 2025-2026 School Year.

    Position Overview
    Mullen High School is seeking to hire an energetic committed teacher to teach Biology, Biotechnology and Physical Science (and other potential science courses). This is a full-time position for the upcoming 2025-2026 school year.

    The applicant would be expected to plan, organize, and implement an appropriate instructional program in a learning environment that guides and encourages students to develop and fulfill their academic potential. The applicant must be able to plan, prepare and deliver instructional activities that facilitate active learning experiences and establish and communicate clear objectives for all learning activities.

    CLICK HERE for the Full Job Description
    This is a full-time, at-will position for the 2025-2026 school year. Compensation from $45,000- $75,000
    depending on years of experience and education.
    Mullen reserves the right to pay more or less than the range.

    Mullen offers a competitive benefits package that includes health insurance and partially paid dependent premiums, an employer-paid defined benefit retirement plan, an employer 403(b) contribution and partial match, employer-paid life and disability insurance, a cafeteria plan, and generous paid time off.

    Application Deadline: Friday, Feb 28, 2025
    Interviews will begin for qualified applicants as soon as materials are received
    Submit a cover letter, resume, & three references to HR@51rkb.com

  • Social Studies Teacher (2025-2026 School Year)

    Job Opening Full-Time Social Studies Teacher

    Mullen High School is seeking to hire an energetic committed individual to serve as a Social Studies Teacher. This is a full-time opening for the 2025-2026 School Year.

    Position Overview
    Mullen High School is seeking to hire a faith-filled, energetic, committed social studies teacher to teach classes potentially including classes covering World History, American History, US Government, and/or other topics. The applicant would be expected to plan, organize, and implement an appropriate instructional program in a learning environment that guides and encourages students to develop and fulfill their academic potential. The applicant must be able to plan, prepare, and deliver instructional activities that facilitate active learning experiences, establish and communicate clear objectives for all learning activities. The ideal candidate will be an integral member of Mullen’s Social Studies Department and embrace the opportunity to be a role model to students not only in their academic development but also in their faith and personal development as well. As Lasallian and Catholic educators, we work to inspire our students academically, spiritually, and emotionally equally and anticipate that teachers who wish to join our staff look forward to this critical part of our work.

    Teachers at Mullen High School engage in the central mission of the school which is to promote academic excellence and spiritual development in the context of the teachings of the Catholic Church.
    CLICK HERE for the Full Job Description
    This is a full-time, at-will position for the 2025-2026 school year. Compensation from $45,000- $75,000
    depending on years of experience and education.
    Mullen reserves the right to pay more or less than the range.

    Mullen offers a competitive benefits package that includes health insurance and partially paid dependent premiums, an employer-paid defined benefit retirement plan, an employer 403(b) contribution and partial match, employer-paid life and disability insurance, a cafeteria plan, and generous paid time off.

    Application Deadline: Friday, Feb 28, 2025
    Interviews will begin for qualified applicants as soon as materials are received
    Submit a cover letter, resume, & three references to HR@51rkb.com

  • Substitute Teachers Pool

    Mullen High School is seeking Substitute Teachers to cover classes for teachers who are on retreat, attending conferences, or traveling to school-related events. Substitute teachers will be asked to monitor classes, proctor tests, and deliver simplified lesson plans.
    For any candidates that are interested in serving as a substitute for Mullen High School should send an e-mail to HR@51rkb.com with a resume and cover letter explain which courses you would be willing to substitute. 

Coaching Positions

List of 4 items.

  • Assistant Coach - Girls' Lacrosse

    Mullen High School is seeking to hire an energetic committed individual to serve as an Assistant Girls’ Lacrosse Coach. This is a part-time, opening for the 2024-2025 School Year.

    Mullen High School is a Lasallian, Catholic, and college preparatory school conducted in the tradition of the Christian Brothers to give a human and Christian education to the young, especially the poor, as established in our five Lasallian Core Principles. As a member of one of the largest educational networks in the world, Mullen’s mission is to ensure its students are grounded in the living presence of God, have respect for all persons, are inclusive in their thinking, demonstrate sensitivity toward the poor and those suffering from injustice, and are educated to prepare for excellence in college and all their future endeavors.

    Supporting twenty-six separately gendered programs, Mullen High School has a rich athletic history with over 80 State Championships and hundreds of more individual State Champs. A long-time member of the highly competitive Centennial League, Mullen seeks the best to play to be the best.

    Mullen High School does not unlawfully discriminate or allow unlawful harassment in any of its programs, procedures, or practices based on age, color, disability, national or ethnic origin, political affiliation, race, religion, gender, sexual orientation, military service, or other protected classifications defined by the State of Colorado and local laws.

    The Department of Athletics at Mullen High School has an opening for an Assistant Girls’ Lacrosse Coach to be filled immediately.

    CLICK HERE For the full job description
    This is a part-time position for the 2024-2025 school year. Compensation is $3,349.
    This is a temporary, seasonal position and is not benefit-eligible.
    This position does not come with a full-time position within the school.

    Application Deadline:
    Friday, January 24 at 3:00pm
    Interviews will begin for qualified applicants as soon as materials are received
    Submit a cover letter & resume to HR@51rkb.com

  • Head Coach - Dance

    Job Opening 2025-2026 School Year
    Dance Head Coach
    Mullen High School is seeking to hire an energetic, committed individual to serve as head dance coach. This is a part-time, at-will opening for the 2025-2026 School Year.

    Mullen High School is a Lasallian, Catholic, and college preparatory school conducted in the tradition of the Christian Brothers to give a human and Christian education to the young, especially the poor, as established in our five Lasallian Core Principles. As a member of one of the largest educational networks in the world, Mullen’s mission is to ensure its students are grounded in the living presence of God, have respect for all persons, are inclusive in their thinking, demonstrate sensitivity toward the poor and those suffering from injustice, and are educated to prepare for excellence in college and all their future endeavors.

    Supporting twenty-six separately gendered programs, Mullen High School has a rich athletic history, including over 80 State Championships and hundreds of individual State Champions. A long-time member of the highly competitive Centennial League, Mullen seeks to play the best to be the best.

    Mullen High School does not unlawfully discriminate or allow unlawful harassment in any of its programs, procedures, or practices based on age, color, disability, national or ethnic origin, political affiliation, race, religion, gender, sexual orientation, military service, or other protected classifications defined by the State of Colorado and local laws.

    CLICK HERE for the Full Job Description
    The Department of Athletics at Mullen High School has an opening for a Head Dance Coach.

    This is a part-time at-will position for the 2025-2026 school year. Compensation from $4,060,
    depending on years of experience.

    This is a temporary, seasonal position that is not benefit-eligible and does not come with a full-time position within the school.

    Application Deadline: March 14
    Interviews will begin for qualified applicants as soon as materials are received.
    Submit a cover letter & resume to HR@51rkb.com

  • Assistant Coach - Track & Field (Jumps)

    Mullen High School is seeking to hire an energetic committed individual to serve as an Assistant T&F Coach - Jumps. This is a seasonal, part-time, at-will opening for the 2024-2025 School Year.

    Mullen High School is a Lasallian, Catholic, and college preparatory school conducted in the tradition of the Christian Brothers to give a human and Christian education to the young, especially the poor, as established in our five Lasallian Core Principles. As a member of one of the largest educational networks in the world, Mullen’s mission is to ensure its students are grounded in the living presence of God, have respect for all persons, are inclusive in their thinking, demonstrate sensitivity toward the poor and those suffering from injustice, and are educated to prepare for excellence in college and all their future endeavors.

    Supporting twenty-six separately gendered programs, Mullen High School has a rich athletic history with over 80 State Championships and hundreds of more individual State Champs. A long-time member of the highly competitive Centennial League, Mullen seeks the best to play to be the best.

    Mullen High School does not unlawfully discriminate or allow unlawful harassment in any of its programs, procedures, or practices based on age, color, disability, national or ethnic origin, political affiliation, race, religion, gender, sexual orientation, military service, or other protected classifications defined by the State of Colorado and local laws.

    The Department of Athletics at Mullen High School has an opening for an Assistant T&F Coach, jumps.

    CLICK HERE for the Full Job Description

     
    This is a part-time at-will position for the 2024-2025 school year.
    Compensation from $2,740
    depending on years of experience.

    This is a temporary, seasonal, at-will position and is not benefit-eligible. This position does not come with a full-time position within the school.

    Application Deadline: December 31st
    Interviews will begin for qualified applicants as soon as materials are received
    Submit a cover letter & resume to HR@51rkb.com

  • Assistant Coach - Track & Field (Sprints)

    Mullen High School is seeking to hire an energetic committed individual to serve as an Assistant T&F Coach - Sprints. This is a seasonal, part-time, at-will opening for the 2024-2025 School Year.

    Mullen High School is a Lasallian, Catholic, and college preparatory school conducted in the tradition of the Christian Brothers to give a human and Christian education to the young, especially the poor, as established in our five Lasallian Core Principles. As a member of one of the largest educational networks in the world, Mullen’s mission is to ensure its students are grounded in the living presence of God, have respect for all persons, are inclusive in their thinking, demonstrate sensitivity toward the poor and those suffering from injustice, and are educated to prepare for excellence in college and all their future endeavors.

    Supporting twenty-six separately gendered programs, Mullen High School has a rich athletic history with over 80 State Championships and hundreds of more individual State Champs. A long-time member of the highly competitive Centennial League, Mullen seeks the best to play to be the best.

    Mullen High School does not unlawfully discriminate or allow unlawful harassment in any of its programs, procedures, or practices based on age, color, disability, national or ethnic origin, political affiliation, race, religion, gender, sexual orientation, military service, or other protected classifications defined by the State of Colorado and local laws.

    The Department of Athletics at Mullen High School has an opening for an Assistant T&F Coach, sprints.

    CLICK HERE for the Full Job Description
    This is a part-time at-will position for the 2024-2025 school year.
    Compensation from $2,740
    depending on years of experience.

    This is a temporary, seasonal, at-will position and is not benefit-eligible. This position does not come with a full-time position within the school.

    Application Deadline: December 31st
    Interviews will begin for qualified applicants as soon as materials are received
    Submit a cover letter & resume to HR@51rkb.com

Non-Discrimination Policy

Mullen High School does not discriminate or allow unlawful harassment in any of its programs, procedures, or practices on the basis of age, color, disability, national or ethnic origin, political affiliation, race, religion, gender, sexual orientation, military service, or other protected classifications defined by the State of Colorado and local laws. The policy applies in all aspects of employment with Mullen High School.

HUMAN RESOURCES

Complete the Employment Application and send it with your resume and cover letter to hr@51rkb.com.

Human Resources
c/o Mullen High School
3601 S. Lowell Blvd.
Denver, CO 80236

(303) 761-1764 ext.3336

Contact Human Resources

List of 1 items.

Benefits Overview

List of 8 frequently asked questions.

  • Medical, Dental & Vision

    Mullen offers Medical, Dental and Vision insurance to all eligible employees through Cigna. We strive to maintain low cost to the employee. 

  • Paid Time Off

    Mullen offers a generous paid time off policy for teaching and non-teaching staff. Paid time off includes vacation, sick time, and family sick time. 

  • Educator Tuition Reduction

    After one year of employment with Mullen, eligible employees are able to participate in tuition reduction for dependents enrolled at Mullen High School. The percentage reduction is dependent on the employees years of service. 

  • Retirement Plan

    Mullen participates in a 403(b) retirement plan. Eligible employees can make contributions into the 403(b) plan up to the IRS's annual limitations. 

    Mullen also offers a Defined Benefit Plan fully funded by Mullen. Employees must remain with the company for 5 years to be vested in this plan. 

  • Life and AD&D Insurance

    Mullen provides all eligible employees with Life Insurance and Accidental Death & Dismemberment (AD&D) Insurance at no cost to the employee. We do also offer a supplement insurance to this category at the discretion and cost to the employee. 

  • Short & Long Term Disability

    Mullen provides all eligible employees with Short and Long Term disability at no cost to the employee. Disability insurance provides benefits that replace part of your lost income when you become unable to work due to a covered injury or illness. 

  • Employee Assistant Program

    We are proud to provide a confidential program dedicated to supporting the emotional health and well-being of our employees and their families. The EAP is provided at NO COST to employees through Unum.

  • Flexible Spending Account (optional)

    We give our employees the opportunity to participate in a flexible spending account through 24 Hour Flex. This is a pre-tax deduction that will help cover medical cost throughout the year. 
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