In 1980s, Horan appeared as Lewis in the 1981 film Game of Death II along with Tong Lung and Hwang Jang-lee.
Horan played American Consular in 1987 film No Retreat, No Surrender 2, along with Hwang Jang-lee, Loren Avedon, Matthias Hues, Max Thayer and Cynthia Rothrock, which he also wrote and produced.
Horan served as an Adjunct Assistant Professor in the Hong Kong Polytechnic University.
Roy was the Founder and CEO of Innovea Ltd., a company that trains/consults in higher-order thinking, including creative and mindful approaches for enhancing performance and well-being.
Roy formulated the Ocean Model which combines empirical studies of creativity and intelligence with Eastern philosophical concepts on the same.