Our Team

  • Sumee Chang

    Sumee Chang-Schadt

    Founder. Sumee built a 25 year career in business strategy and operations at the Walt Disney Company. As a lifelong advocate for animal welfare and rescue, her vision at AMP is to promote and enable a more diverse audience to embrace the extraordinary experiences mustangs can bring to our lives.

  • Lori Anne Gaddy

    Lori Anne Gaddy

    Head of Operations, Board Member: Lori Anne Gaddy is a multi-faceted entrepreneur, business developer and community leader. Additionally, she volunteers her time as Director of the Hill Creek Stables in Columbia, MO. Committed to rescue, she shares her heart with Bob, a feral stallion who stole her heart many years ago.

  • Brittany Ference

    Brittany Ference

    Board Member. Brittany currently also serves as the Executive Director for Colorado-based nonprofit, Great Escape Mustang Collaborative. With a background deeply rooted in ranching, mustangs and art, Brittany brings a deep and wide knowledge base to AMP.

Our Team

Sophie Ohiorhenuan

With a passion for creating better lives for horses, Sophie leads community fundraisers, branding and sponsorship opportunities. Her work drives awareness across our communities of the untold stories of America’s wild horses. Sophie is also a long time entrepreneur, artist, professional pastry chef, and mother of 2.

Director Of Development

Henry Merrill

Head Trainer, Henry Merrill Horsemanship

Henry Merrill Horsemanship is rooted in a legacy spanning three generations, tracing back to 1878, when the Merrill family proudly embraced stewardship of the horse. That ethos revolves around living life on our terms and adhering to a unique code. For us, that code unequivocally prioritizes the horse – putting their well-being first, with the understanding that serving the horse is a reciprocal act, benefiting both the equine companion and oneself

  • AMY DUMAS

    AMY DUMAS

    ADVISOR, BLM WILD HORSE AND BURRO SPECIALIST

  • ELLEN

    AMP VOLUNTEER

  • EMERSON

    AMP VOLUNTEER

  • GRAYCE

    AMP VOLUNTEER

  • MAGGIE

    AMP VOLUNTEER

  • OLIVER

    OLIVER YI

    SUMMER INTERN, INTEGRATED STORYTELLING

Training by Henry Merrill Horsemanship

Self regulation is essential to developing any confident and content horse, even more so with formerly wild horses. AMP partners with Henry Merrill to give your mustangs the most balanced foundation possible.

Henry Merrill is a legendary Oregon cowboy, 3rd generation horseman, and on special assignment at AMP to raise mustang awareness.

BLM Tag 6583 (Now Reata, our 2020 Sand Springs HMA Mustang Mare) receives early touches from Henry.