Jacob Experiment is the husband of Gina Experiment and the father of Jacob. Jr Experiment and Daisy Experiment. He is works in the Science Career. He is Level 10 in the Science Career in Sims 1 but has been demoted to Level 3 in The Sims 2. He is most known for kidnapping Mercedes and Charles in Sims 1 along with his wife for Scientific experiments.
He met Mercedes in College when she was majoring in Hairdressing and he was majoring in Science. He was always considered a nerd whereas she was a Cheerleader but despite this the became friends although he resented her slightly. After they'd graduated, he carried on to study Science A levels whereas she started her own small hairdressing business. Here he met his future wife, Gina. He proposed and they married just before graduation.
After they graduated they both became top level Scientists and grew very rich. About a year level, Mercedes came for help because her shop had failed. They said she could stay and took her to their guest room. When she joked that she could get use to this room they smiled and said "Don't". As she was sleeping they carried her to their suite which was beautiful but there was no way out. Little did she know that the mirrors were really windows. For a year she stayed in there alone but then one day a man called Charles who was a con man saw an advert for a Lodger. As he slept in the Blue Room, the carried him into the suite. Everyday, Jacob and Gina observed their reactions. One day he decided to add an extension to the suite and everyday the put a new object in there to observe the reactions. In the Sims 1, Jacob and Gina tried to have a baby to carry on their work on Mercedes and Charles. They still observe the suite everyday and change the object through a secret wall panel. He is a bit of a loner and doesn't know anybody at all in Neighborhood 3 yet. His wife, Gina thinks they should free Mercedes and Charles but he doesn't think so. Sometime between the Sims 1 and Sims 2, Jacob and Gina have managed to have twins Jacob. Jr and Daisy. Also Gina frees Mercedes and Charles causing them both to be arrested but they were let out on bail from their son and daughter. They lost their money, house and credibility and moved to a smaller house. Gina died of disease and now he lives alone with his teenage son. In the Sims 2, although he still has a job, he is at a low level. He is very poor and barely survives on his low income. He misses his wife immensely and doesn't approve of his son dating an alien Quinn Space, daughter of Kylie Space and Fricorth Space (née. Tricou). Jacob aged up unhappily.
As an elder, Jacob retired but didn't stop his scientist nature. He became obsessed with mastering everything, even death. He believed conquering death would make him all powerful and he was determined to do it. He created a monster that could take other's life to add to his. He nicknamed it the Cow Plant and he used it on innocent passers by. He created an elixir that gave him life without having to take somebody else's -not that he cared either way. But finally his best invention of all, a creation that allowed people to be resurrected. He needed the body and they could be brought back. He was sure. He had tested it on animals before but he needed something else to test something. He wanted to see if it changed people, personality wise but he needed to have known them before and after to see. If only there were somebody like that...