Johnny Dale Callahan

Johnny was a man of extraordinary spirit. He was lively, adventurous, and free-spirited, someone who truly never met a stranger. He had a deep love for travel and exploration, embracing the world with curiosity and a sense of adventure that defined the way he lived his life. Having set foot on nearly every continent and having lived in various parts of the world, including Egypt, Peru, and Kazakhstan, he was truly a man of the world. He had a remarkable ear for language and could often identify exactly where someone was from, down to their city, simply by their accent.

Johnny was also a talented chef, expressing his creativity through food just as he did through music and life. He loved bringing flavors from around the world into his cooking, from his famous stroganoff to a Thanksgiving stuffing that quickly became a family favorite. His creativity and passion were evident in everything he touched.

He was a phenomenal musician and guitarist, and he shared that gift freely, encouraging a love of music in his children and passing it on in a way that continues to live through them.

At the center of Johnny’s life was his family. He loved his wife, Dana, dearly and was a proud father. He took great joy in his children’s lives and accomplishments, always encouraging them to pursue their passions and become the fullest expression of themselves. His love, pride, and presence left a lasting impression on each of them.

Johnny was also a highly accomplished scientist and virologist specializing in veterinary medicine. He earned his PhD in Pathology and dedicated his career to advancing animal health diagnostics. His 2002 research paper became foundational in the global detection of Foot-and-Mouth Disease, cited by scientists around the world. In his role at Tetracore, he was instrumental in the development of groundbreaking PCR diagnostic tests and played a pivotal role in securing USDA licensure for the company’s assays detecting Foot-and-Mouth Disease Virus and African Swine Fever Virus. As the lead and foundational developer of these tests, his work helped protect livestock industries and safeguard food systems on a global scale, leaving a lasting impact on the scientific community.

Johnny is survived by his wife, Dana Callahan; his children, Erin Callahan, Audrey Callahan, Jose Callahan, Julio Callahan, and Henry Callahan; his mother, Joan Callahan; and his sister, Jacquelyn Wasser.

He leaves behind a legacy of curiosity, courage, music, and love. His light touched countless lives, and his presence will be deeply missed.

A funeral service will be held on April 22 at 11:00 AM at El Camino Mortuary & Memorial Park, located at 5600 Carroll Canyon Road, San Diego, California. A celebration of life will take place on April 21 in Dulzura.

In honor of Johnny’s life, donations may be made to support his memorial at:

https://www.gofundme.com/honoring-johnny