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- Theodore Jacobson (thermodynamical derivation of Einstein's field equation),
- Robert T. Jantzen (streamlined Bianchi classification, gravitoelectromagnetism),
- Jørg Tofte Jebsen (Birkhoff's theorem),
- George Barker Jeffery (Baldwin/Jeffery plane wave),
- Pascual Jordan (Jordan/Brans/Dicke theory),
Read more about this topic: Contributors To General Relativity