Kook Jin "Justin" Moon was born in Seoul, Korea on June 14, 1970 (lunar calendar).  He came to the U.S. in 1973 where he has lived ever since.  He studied for his bachelor of arts degree in economics at Vasser College in New York.  Kook Jin graduated Magna Cum Laude from Harvard University with an MBA.

In 2004 Kook Jin Moon married Ji Hye Park and together they have four children. 

Over the years, Kook Jin Moon has provided invaluable business leadership for many of the companies founded by Rev. Moon, especially in Korea.   he serves as the President of Saeilo Enterprises, Inc.  Additionally, Kook Jin Moon serves as Chairman of the Young Jin Moon Charitable Foundation which provides educational scholarships and supports a number of non-profit enterprises.

In April 2006, Kook Jin Moon was elected by the board of Unification Church International (UCI) to the position of Vice President.  UCI has oversight responsibilities for a wide range of projects and, through One Up Enterprises, various businesses.  These include News World Communications, Inc. and True World Group.  He is also the CEO of the Unification Foundation in Korea.