Throughout many of his endeavors, Marshall turned most of his business associations into friendships; including J.R. Parten, Fred Koch and his sons, Oscar Wyatt and E.O. Buck.
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In 1941, he was called back to Washington, D.C. during the war as Solicitor of the Petroleum Administration for War, helping develop America's energy policy during the war including the Cole Pipeline Act of 1941, and later as a member of the Committee on Reparations, the National Petroleum Council and the American Petroleum Institute.
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At Yale, he was case editor of the Yale Law Journal and studied with the law and economics pioneer Walton Hale Hamilton.
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Unity and Diversity in New Testament Theology: Essays in Honor of George E. Ladd (ISBN 080283504X), which included contributions by Leon Morris, William Barclay, F. F. Bruce, I. Howard Marshall, Richard Longenecker and Daniel Fuller.
Marshall's main interests in research have been the Gospel of Luke and Acts, the Pastoral Epistles, and aspects of New Testament theology.
The journal has consistently attracted attention with articles by leading biblical scholars and theologians including Richard Bauckham, Larry Hurtado, I. Howard Marshall, N.T. Wright, Craig Blomberg, R.T. France, Simon Gathercole, D.A. Carson, and Alister McGrath.