The Christian Writers Institute was founded by Robert Walker in 1945. Walker was also active in founding many Christian organizations like the Evangelical Press Association (EPA), the Christian Broadcasting Network (CBN), and the Christian Booksellers Association (CBA). In the mid-1950s Walker launched Christian Bookseller, the first trade magazine targeting religious book retailers (it later became Christian Retailing).

When he passed away in 2008 it was said that Robert Walker "was a giant in our industry." Doug Trouten, executive director of the Evangelical Press Association, said, "The Christian journalism world has grown significantly since those early days, but only because we stand on the shoulders of giants like Bob Walker."

His legacy was enormous. For ten years (1941-1951) he was an assistant professor at Wheaton College where he developed their journalism program. During this time, he helped publish HIS, InterVarsity Christian Fellowship’s first magazine.

Walker took over the national magazine Church School Promoter and renamed it Sunday in 1943. In fact it was in that magazine where Walker published the first national story on Billy Graham. In 1948, Walker merged Sunday and Christian Life & Times, after acquiring it from a friend, into Christian Life which remained influential for many decades. In 1986 it merged with Charisma magazine where it was the flagship publication of Strang Communications. Walker mentored Stephen Strang, now president of Strang Communications. "Beyond all his accomplishments, Bob Walker was a deeply spiritual man, who lived a life of utmost integrity," Strang said. "He impacted the lives of millions and will continue to through the publications he founded."

As mentioned, Walker was also active in the founding of many organizations, including the EPA, CBN, Christian Life Missions (which he created to help missionaries), and the Christian Booksellers Association. Walker launched Christian Bookseller, the first trade magazine targeting religious book retailers (it later became Christian Retailing). He also started Creation House, which published A New Song by Pat Boone in 1970. "He was an incredible man," Boone said. "There was an Old Testament quality to him, like I was talking to a modern Gideon or one of the patriarchs."