Mitsuru Hirata, one of the field planners on Shin Megami Tensei: Strange Journey, is the director of Radiant Historia. Tatsuya Watanabe, the other Strange Journey field planner, is handling Radiant Historia’s field planning. Kenichi Takamori is another Strange Journey staffer. He worked on demon fusing before and is an event planner in Radiant Historia.
This game’s battle planner is Sawao Kato who also worked as a battle planner on Persona 3 and Persona 4. Daisuke Yajima also worked with the Persona series. He was a programmer on Persona 4 and Persona 3 Portable. He’s also doing programming for Radiant Historia.
Atlus main series is Shin Megami Tensei so this shouldn’t be too surprising to see some overlapping, but it will be interesting to see what elements these team members bring to a spiritual successor of Radiata Stories.