Treven Wax recently wrote that there is a theologian we should all know and I agree.
George Eldon Ladd is said to be one of the most influential scholars of the 1900’s. It was Ladd who popularized the view of the kingdom as two dimensional by describing it with the “already inaugurated -not yet consummated” paradigm.
He argues that there is a tension between the already realized and future eschatology throughout the entire New Testament. While the future Kingdom of God already has broken into the present reality, its fullness remains to be consummated with the second coming.
Now deceased, Ladd is considered a premier Kingdom theologian and any serious study of eschatology should include time invested to read “The Gospel of the Kingdom” and “The Presence of the Future“.
Other great books that I can personally recommend:
“The Blessed Hope“- His central thesis is the second coming is The Blessed Hope, not a pre-tribulational rapture.
“A Theology of the New Testament“- Ladd’s magisterial work on New Testament.