Question: Which of the founders of the of the Creation Research Society and the Institute for Creation Research, also co-authored a book, that according to Ronald Numbers, elevated young earth creationism "to a position of fundamentalist orthodoxy." ?

Context paragraphs:
Frank Lewis Marsh: Frank Lewis Marsh (18 October 1899, Aledo, Illinois – 14 July 1992) was an American Seventh-day Adventist biologist, educator and young Earth creationist author.  In 1963 he was one of the ten founding members of the Creation Research Society.

Institute for Creation Research: The Institute for Creation Research (ICR) is a Creationist apologetics institute in Dallas, Texas that specializes in media promotion of pseudoscientific creation science and interpretation of the Genesis creation narrative as a historical event.  The ICR adopts the Bible as an inerrant and literal documentary of scientific and historical fact as well as religious and moral truths, and espouses a Young Earth creationist worldview.  It rejects evolutionary biology, which it views as a corrupting moral and social influence and threat to religious belief.  The ICR was formed by Henry M. Morris in 1972 following an organizational split with the Creation Science Research Center (CSRC).

Hendren v. Campbell: Hendren et al. v. Campbell et al. was a 1977 ruling by an Indiana state superior court that the young-earth creationist textbook could not be used in Indiana public schools.  Jon Hendren, a ninth-grade student in the West Clark Community Schools, sued when the district picked "Biology: A Search For Order In Complexity", published by the Creation Research Society and promoted through the Institute for Creation Research, as the sole biology textbook.

Old Earth creationism: Old Earth creationism is an umbrella term for a number of types of creationism, including gap creationism, progressive creationism, and evolutionary creationism.  Old Earth creationism is typically more compatible with mainstream scientific thought on the issues of physics, chemistry, geology, and the age of the Earth, in contrast to young Earth creationism.

RATE project: The RATE project (Radioisotopes and the Age of The Earth) was a research project conducted by the Creation Research Society and the Institute for Creation Research between 1997 and 2005 to assess the validity of radiometric dating and other dating techniques in the light of the doctrine of a recent creation.  It was funded by $250,000 from the Institute for Creation Research and over $1 million in donations.  The RATE team was chaired by Larry Vardiman (meteorology) and included Steven A. Austin (soft rock geology), John Baumgardner (geophysics), Steven W. Boyd (Hebrew), Eugene F. Chaffin (physics), Donald B. DeYoung (physics), Russell Humphreys (physics) and Andrew Snelling (hard rock geology).

Creation Research Society: The Creation Research Society (CRS) is a Christian research group that engages in creation science.  The organization has produced various publications, including a journal and a creation-based biology textbook.  During the first few years of its existence, different beliefs about Creationism and disagreement over its statement of beliefs resulted in various members of the board and voting members being forced out of the organization.

Young Earth creationism: Young Earth creationism (YEC) is a form of creationism, a religious belief which holds that the universe, Earth, and all life on Earth were created by direct acts of God less than 10,000 years ago.  Its primary adherents are Christians who subscribe to a literal interpretation of the creation narrative in the Bible's Book of Genesis and believe that God created the Earth in six 24-hour days.  In contrast to YEC, old Earth creationism is the belief in a metaphorical interpretation of the Book of Genesis and the scientifically-determined estimated ages of the Earth and Universe.

The Genesis Flood: The Genesis Flood: The Biblical Record and its Scientific Implications is a 1961 book by young earth creationists John C. Whitcomb and Henry M. Morris that, according to Ronald Numbers, elevated young earth creationism "to a position of fundamentalist orthodoxy."

Gap creationism: Gap creationism (also known as ruin-restoration creationism, restoration creationism, or "The Gap Theory") is a form of old Earth creationism that posits that the six-"yom" creation period, as described in the Book of Genesis, involved six literal 24-hour days (light being "day" and dark "night" as God specified), but that there was a gap of time between two distinct creations in the first and the second verses of Genesis, which the theory states explains many scientific observations, including the age of the Earth.  It differs from day-age creationism, which posits that the 'days' of creation were much longer periods (of thousands or millions of years), and from young Earth creationism, which although it agrees concerning the six literal 24-hour days of creation, does not posit any gap of time.

Henry M. Morris: Henry Madison Morris (October 6, 1918 – February 25, 2006) was an American young Earth creationist, Christian apologist, and engineer.  He was one of the founders of the Creation Research Society and the Institute for Creation Research.  He is considered by many to be "the father of modern creation science."  He is widely known for coauthoring "The Genesis Flood" with John C. Whitcomb in 1961.

Supporting paragraphs: The Genesis Flood Henry M. Morris
Answer: Henry M. Morris