Ted Caplan was born in London in 1968, into a family of artists and writers. His father was a journalist, and his mother was a painter. From a young age, Caplan was surrounded by creative people, which nurtured his love for storytelling. He attended the University of Manchester, where he majored in English Literature. After graduation, Caplan started his career in the entertainment industry as a script editor. He worked for various production companies and TV networks, honing his skills in story development and script analysis. As a script editor, he had the opportunity to work on several successful TV shows, including "The Bill" and "Spooks." Caplan's talent for writing soon became apparent, and he transitioned to screenwriting. He wrote his first TV script for "The Bill," which was well-received and led to more writing opportunities.

He went on to write scripts for several popular TV shows, including "Doctor Who," "Silent Witness," and "Midsomer Murders." His writing was commended for its intricate plots, strong characters, and social commentary. Caplan's work as a screenwriter also extended to the film industry. In 2007, he wrote the screenplay for the British drama film "The Hide," which premiered at the Berlin Film Festival. The movie received critical acclaim and was praised for its intelligent storytelling and nuanced characters. Caplan's screenplay was celebrated for its attention to detail, character development, and ability to create suspense. Caplan's success as a screenwriter also led to teaching opportunities. He taught screenwriting at various universities in the UK, including the University of Central Lancashire and the University of Bedfordshire.

He was known for his ability to mentor young writers and help them develop their skills. Caplan's work has been recognized with several awards and nominations, including a BAFTA nomination for his work on "Silent Witness." He is regarded as one of the UK's most talented and accomplished screenwriters, known for his ability to craft engaging stories that resonate with audiences. Outside of his work in the entertainment industry, Caplan is an avid traveller and has visited several countries worldwide. He also enjoys hiking and spending time outdoors.