Arjan Lock published the book 'Geloof, Hoop en Liefde' in 2020, which explores the themes of faith, hope, and love through personal anecdotes and reflections. The book was well-received for its insightful commentary on the role of these virtues in contemporary life, further establishing Lock as a thoughtful voice in religious discourse.

In 2018, Arjan Lock launched 'Ik Mis Je', a television program that addresses themes of loss and mourning. The show features personal stories from individuals who have lost loved ones, providing a platform for sharing grief and healing. Lock's empathetic approach has been praised for its sensitivity and depth.

Arjan Lock became the host of 'Nederland Zingt', a popular EO television program focused on Christian hymns and music. His role involved not only presenting the show but also engaging with the audience and guests, further solidifying his reputation as a key figure in religious broadcasting in the Netherlands.

In 2010, Arjan Lock was appointed as the director of the Evangelische Omroep (EO). As director, he was responsible for overseeing the organization's programming and strategic direction, ensuring that EO's content continued to reflect its Christian values while appealing to a broad audience.

Arjan Lock began his career with the Evangelische Omroep (EO) in 2004, where he took on the role of presenter. His work focused on religious and social issues, which aligned with EO's mission to provide Christian-based content to the Dutch public. This role marked the beginning of his long-standing association with the broadcaster.