Jérôme knew his love of science as early as the age of 8, when his uncle gave him a little chemist's kit for his birthday. His parents being overprotective people, he was unfortunately not allowed to touch his present. Being attracted by the ban, he used it in secret every night and was always euphoric when he put on his blouse.
When he entered college, he was finally able to use his kit with his parents' permission. He was also able to start having real science classes, even though the students at his college were not very kind to him. He was only able to really flourish in high school, getting closer to other studious people and had no problem achieving excellent grades. At university, he took a biology course and a science course, as well as taking courses in the subjects he was interested in. He also started dating girls, even though it was not a big deal for Jerome. He got a degree and was made valedictorian and decided to travel while becoming a philosophy teacher.
So he started working in Italy after taking Italian classes and learning the language. He found love with Rebecca, a colleague from the university where he worked. They lived together for many years and got married. They had a daughter, Tess. But overnight, Rebecca disappeared with the baby, leaving Jerome alone in Italy. It took him a long time to recover, blaming himself without knowing what he had done wrong. He finally resumed his work, continued his scientific practices without liking it as much as before. He finally died around the age of 60, not finding it useful to deviate when a car hit him on the road.

Jérôme arrived at the Academy upon his death, and immediately received offers of employment in various scientific laboratories that heard about his exemplary scientific career. He accepted because he didn't know what else to do, and took a liking for the science offered by the Academy, which had techniques as yet unknown on Earth. He also became interested in medicine and took a few courses, thinking that it could still be practical one day.
Although he enjoyed the life of a scientist at the Academy, he travelled to many cities looking for a place to settle, but none of them made him want to stay. He finally decided to move to CastleTown, having no real reason to leave. After a few months, he left the lab where he worked to open his own lab so he didn't have to travel every day. Since he had decided not to block out his age, he began to age, and the doctors advised him to either get younger through magic or wear adult diapers. Not being attracted to either, he created an incubator to rejuvenate the cells of his body and became a young adult of 25 years old again.
He started dating Tawnie, a young woman with whom he had a child, Krystal. He was also able to find his daughter Tess who had recently moved to the nearby town, he learned that Rebecca was pregnant with a little boy, Arnold, when she left, so he realized that he was also Arnold's father. He was happy to have found his lost children, even though he dreaded the thought of seeing Rebecca again. When this happened, he tried to be courteous to his children even though she lived in the same town as them.
Following his break-up with his new girlfriend, Tawnie, he became severely depressed and tried to end his life, even though it was impossible. He tried to date Tawnie again, but Tawnie was hurt by Jerome's post-breakup behavior, he had had an affair with his ex-wife and had not been very friendly with Tawnie. He spent time in a psychiatric hospital, from which he was afraid to return when he learned that many people resented him for what he had done. He knows that many people are still angry with him but he is trying to recover from everything that happened.
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