In 1981 Allen founded Allen and Caron, which now has offices in Irvine, California, and New York City, with affiliates in London and Milan. He spent the 1970s in various areas of media and communications. Initially he was an editor and later a marketing manager for scholarly and educational book publishers; he then moved on to serve in the cutting-edge public affairs department at Atlantic Richfield Company in the mid-1970s. When he left Atlantic Richfield, he became vice president and general manager of the southern California region of Bozell & Jacobs Public Relations.
Allen has served on the boards of several small companies, including Westergaard.com, the publishing enterprise of the late John Westergaard. He is the co-author of a college text on system life cycles and books on business communications and continuing education. He has written a book on sandcastles, and has written on a variety of topics for numerous leading magazines and newspapers, and has been active in several charities. He is currently working on a family memoir and a novel.
Allen has also been a contributing author for the "Inside the Minds" series of C-Level Business Intelligence™ books published by Aspatore Books, a Thomson Reuters business. His contributions include a chapter in Public Relations Leadership Strategies titled Investor Relations: Creating a Dialogue with the Investor and a chapter in Public Relations Best Practices 2008-2009 titled Cross-Border Companies: A Fast-Increasing Trend in Investor Relations.