The Amplify Team
Our dream is for every young person to grow up in a community that supports them and their dreams, and provides the education and resources to plan their entire future.
Alexandra Ledezma
Program Manager
She / Her / Ella
Alex Ledezma joined Amplify in October 2022 as the Latine and Hispanic Initiatives Coordinator and was promoted to Program Manager in May 2025. Alex was born and raised in Las Vegas, NV where she attended the University of Nevada, Las Vegas. She moved to Tulsa in 2017 where she joined Teach for America. Before joining Amplify, Alex taught at Felicitas Mendez International School for 5 years. She has a love for youth and knows how capable they are when given the resources they deserve. Alex is passionate about bilingual education, sexual health, and the Latin Community. When you don’t see her out and about serving the community, she’s teaching Zumba classes around Tulsa!
Brittany Banh
Community-Based Youth Leadership Council Coordinator
She / Her / Hers
Brittany Banh joined Amplify in October 2024 as the Community-Based Youth Leadership Council Coordinator. Brittany is from Bartlesville, OK, and attended the University of Tulsa, where she earned a Bachelor’s degree in Psychology & Women’s and Gender Studies. She has previous experience working in the non-profit sector, having served as a development intern at Domestic Violence Intervention Services and an intern at the Oklahoma Center for Community and Justice. During her time at TU, Brittany worked on advancing peer-to-peer educational programming that focused on sexual violence prevention and bystander intervention training. Brittany is dedicated to advocating for the expansion of holistic sexual health education as a means of preventing negative health outcomes and sexual violence. Brittany centers her work around values of youth voice, reproductive justice, and cultural inclusivity. Outside of work, Brittany enjoys working out, going to concerts, curating niche playlists, and spending time with family and friends.
Cristine Segui-Harris
Operations and Administrative Manager
She / Her / Hers
Cristine Segui-Harris joined Amplify as the Operations and Administrative Coordinator in July 2022 and was promoted to Operations and Administrative Manager in August 2024. She earned an Associate degree’s in Liberal Arts from Tulsa Community College and a Bachelor’s degree in American Studies from Oklahoma State University. Cristine is an avid reader and has previously worked at local bookstores like Border’s, Barnes and Noble, and Magic City Books. Prior to moving to Tulsa, she worked as a Program Coordinator for a collaborative group between Youth & Family Services and AutismOklahoma called Bee’s Knees, which is an art group for adults with Autism. Cristine has always had a passion to help people in whatever capacity they need. Being a parent and having worked at a preschool, her love for children and youth led her to Amplify.
Crystal J. Carter
Deputy Director
She / Her / Hers
Crystal J. Carter joined Amplify in June 2025 as the Deputy Director. She is a nonprofit leader, neurodiversity advocate, and narrative researcher from Tulsa, Oklahoma. She holds degrees from the University of Tulsa and the University of Oklahoma and is currently a doctoral candidate at Oklahoma State University, where she received the prestigious Distinguished Graduate Fellowship for 2024 to 2025.
She brings over 20 years of experience leading nonprofit programs in Tulsa, Houston, Sacramento, the East Bay, Miami, Fort Lauderdale, Midland-Odessa, and Memphis. She is also a prolific author, having penned the celebrated coloring books Black Like Me and Black Like Me: Men + Boys Edition, which highlight the beauty and diversity of Black individuals.
As a digital content creator, Crystal’s portfolio includes notable works such as Hip Hop & Healing: Commemorating Tulsa with BBC Radio, the award-winning film Greenwood Ablaze: A Tulsa Race Massacre Art Documentary, and the Blacks in STEM interview series for the New Classrooms Innovation Project. She is also the visionary behind ZDay, a charitable initiative dedicated to honoring children and families navigating neurodivergence. Through ZDay, she produced The Misadventures of Super Zo, an animated series that explores themes of neurodiversity, childhood literacy, and pediatric health.
In 2020, she welcomed her daughter, Zoe Evelyn Carter, a 77-day NICU graduate who continues to inspire her with lessons in resilience and joy.
Donna Willis
Grants Manager
She / Her / Hers
Donna Willis joined Amplify in July 2020 as the Grants Manager. Donna has a varied background, including obtaining a bachelor’s degree in Psychology, running a home business as a medical transcriptionist, training as a horticultural therapist, freelance editing, and serving as office manager for the Zarrow Center for Learning Enrichment at the University of Oklahoma. Donna has experience assisting with writing and administering a range of large-scale federal grants, as well as state and agency grants. She also served on the research team that developed the Transition Assessment and Goal Generator and assisted with data management and technical writing.
Heather Duvall, MA
Executive Director
She / Her / Hers
Heather Duvall returned to Amplify as its Executive Director in November 2020. In her previous five-year tenure, from 2013 to 2018, she was the Director of Programs at Amplify (previously known as Tulsa Campaign to Prevent Teen Pregnancy) where she guided strategic direction for the organization and established sexual health education in Tulsa Public Schools.
Heather is a leader in the nonprofit sector in Oklahoma and a national leader in the adolescent health and development field. Prior to Amplify, she held leadership roles at CAP Tulsa and Oklahoma Institute for Child Advocacy, and taught at the University of Central Oklahoma. Most recently she was the statewide Director of Programs for the Oklahoma Chapter of the Alzheimer’s Association.
For over 20 years, Heather has been advocating for educational opportunities and uniting diverse groups toward a shared vision to make our communities a place where all young people are valued. She was raised in rural Oklahoma and has a Master’s Degree in Communication from the University of Oklahoma and a Bachelor’s degree from Oklahoma State University.
Jenny Briggs, MSW, LMSW
Director of Learning and Impact
She / Her / Hers
Jenny Briggs joined Amplify in August 2019 as the Director of Learning and Impact. Jenny is a lifelong Tulsan who brings a strengths-based, systems-oriented approach and passion for youth voice to her work. She earned her Master of Social Work from the University of Oklahoma in 2014 and is licensed by the Oklahoma State Board of Licensed Social Workers at the LMSW level. Jenny has over a decade of experience at the intersection of public health and community-based social work. In her current role, Jenny guides the strategic vision for Amplify’s capacity-building programs, supporting program staff and external partners to advance youth sexual health and well-being in Tulsa. In addition to working as a sexuality educator for four years, Jenny’s experiences include positive youth development, trauma-responsive care, team management, program development and evaluation, and leveraging community partnerships to achieve long-term goals.
Lindsey Cain
Public Health Initiatives Manager
Maddie Miner
Communications & Marketing Manager
She / Her / Hers
Maddie Miner joined Amplify in August 2024 as the Communications & Marketing Manager. Originally from mid-Missouri, Maddie relocated to Oklahoma in 2017 after meeting her wife. She earned a Bachelor’s degree in Multimedia Studies with a minor in Humanities from Northeastern State University in 2020. At Amplify, she leverages her background in community-based healthcare to enhance how health-related information is shared with the public. Her work focuses on celebrating diversity, amplifying youth voices, and ensuring essential information is accessible to Oklahomans and beyond. Outside of work, Maddie loves exploring Tulsa, traveling, discovering new coffee spots, and spending time with her three-legged dog, Bubby.
Samantha Higgs, MS
Capacity and Outreach Manager
She / Her / Hers
Samantha Higgs joined Amplify as the Capacity and Outreach Coordinator in November 2020. Samantha previously worked as a Health Education Specialist at Youth Services of Tulsa serving youth around the Tulsa area by providing sexual health education and assisting young people in connecting with clinics for their sexual health care. She has served as the secretary for the Tulsa Health and Education Coalition since January of 2018. In addition to working in the sexual health field, Samantha has worked with individuals with disabilities, individuals with mental illness and advocating for youth by recognizing young people have agency. Samantha was awarded the Rising Star award from Oklahoma State University College of Human Sciences in 2018. She received her bachelor’s degree from Oklahoma State University in Human Development and Family Science in 2014 and earned her Masters from Oklahoma State University in HDFS with a focus on Child and Family Services in 2017.
Sierra Carter, CHES
Training Manager
She / Her / Hers
Sierra Carter joined Amplify in June 2023 as the Training Manager. For nearly 12 years, she worked in the Tulsa Health Department’s PREP program as an Adolescent Sexual Health Educator where she implemented various sex ed programs in Tulsa County school districts and youth-serving organizations. She also continues to serve as a nationally certified trainer for evidence-based intervention programs where she facilitates best practices in sex education and positive youth development. What fuels Sierra’s passion for adolescent health is the incredible people that she shares this work with in empowering young people to become the very best advocates for themselves! She received her bachelor’s degree from Oklahoma State University in Health Promotion and maintains her credentials as a Certified Health Education Specialist.
Tomas “Tammy” Delocéano
Training and Outreach Coordinator
Any Respectful Pronouns
Tomas “Tammy” Delocéano is a charismatic, neurodivergent Latinx artist and youth advocate who joined Amplify in 2020. For over a decade, Tammy has collaborated with young people to co-create award-winning, nationally recognized programs, including body-positive fashion clubs, empowerment spaces, summer camps, and Amplify’s Youth Leadership Council. As Amplify’s Training and Outreach Coordinator, they focus on building skills to engage and uplift youth. Drawing on their art background and a “Human Relations degree from the School of Life,” Tammy champions the power of representation and youth voice, infusing their activism and trainings with creativity, compassion, and a drive to dismantle adultism and body negativity.