Ewon was born and raised in Bundu Tuhan, Ranau. A village located at the foot of the tallest mountain in South East Asia, The Mount Kinabalu. He is married with six children and has a Bachelor of Legislative Law (LLB) conferred by the University of Malaya. After graduation, he became a lawyer and owned a Law Firm, Tetuan Vitales Ewon & Co, in Kota Kinabalu. In 1979, Datuk Ewon was appointed as a First Class Magistrate, which he served for more than five years.