He considered scientific research as an act of obedience to God’s command to “subdue the earth” (Genesis 1:28). He also knew that the Lord Jesus Christ is the Lord of Science. “For by Him all things were created…” (Colossians 1:16). He made the Lord Jesus the Director of his research laboratory and he, Professor Fomum, took the place of deputy director. He attributed his scientific success to the revelational leadership of the Lord Jesus. In his passion to know Jesus and to make Him known, he read over 1350 books on the Christian faith and authored over 150 to advance the Gospel of Christ. Four million of his books are in circulation in 11 languages. Sixteen million Gospel tracts authored by him are in circulation in 17 languages. 

He also considered fasting as one of the major weapons for Christian Spiritual Warfare. He carried out over 250 fasts ranging from 3 to 40 days, drinking water only. During some of his long fasts he also took water-soluble vitamins. Recently, the Lord called the Professor to battle with the hosts of wickedness in heavenly places through supra-long fasts (between 52 and 80 days). In obedience to this call, he accomplished 3 of such supra-long fasts. Professor Fomum saw the importance of redeeming money and investing it into reaching those without Christ with the glorious Gospel. He therefore chose a life-style of simplicity and “self-imposed poverty” in order that their income should be invested into the critical work of evangelism, soul-winning, church-planting and the perfecting of the saints. His wife and him grew to investing 92.5% of their earned income from all sources (salaries, allowances, royalties and cash gifts) into the Gospel. This was with the hope that, as they grew in the knowledge and the love of the Lord and the perishing souls of men, they would one day invest 99% of their income into the Gospel.

As a passionate Evangelist and Preacher of the Gospel, he travelled extensively. He went out of his base in Yaounde on over 700 missionary journeys in Cameroon that ranged from 1 day to 3 weeks. He also embarked on over 500 missionary journeys that ranged from 2 days to 6 weeks, to over 70 nations on all the six continents.

This family man was married to Prisca Zei Fomum and their 7 children are involved with them in the work of the Gospel. His wife, Prisca, is a national and international Minister to Children and specializes in winning children to the Lord Jesus and making them into His disciples. She is also involved in imparting the vision of the Ministry to Children, and in raising and building up Ministers to Children.

On the 14th of March 2009, while Brother Zach was on his way to Bambili, a small town in the Northwest Province of Cameroon, he was called home by the Lord. He had finished his task. It was a glorious exit. He was called home from the battle field. We can truly say of Brother Zach that he fought the good fight, he finished his course and he kept the faith. Praise be to God for a life lived for the exclusive glory of the Lord!