Co-founder, Subaru Tecnica International (STI) · Birth/death dates not established
Noriyuki Koseki
Prepared a Subaru FF-1 for the 1971 Baja 500 and campaigned Subarus independently in the Safari Rally from 1979 — a rallying track record predating STI's founding by nearly two decades — before co-founding STI with Ryuichiro Kuze in 1988.
“The privateer racer whose own rally career predates the performance division he went on to co-found by nearly twenty years.”
Racing Subarus before STI existed
Per Wikipedia's "Subaru Tecnica International" article — a substantially stronger source than an earlier enthusiast blog post this project previously relied on — Koseki helped prepare a Subaru FF-1 entered in the 1971 Baja 500 by San Bernardino Subaru dealer Jack Coyle, then campaigned Subarus independently in the Safari Rally starting in 1979.
Co-founding STI
Koseki co-founded Subaru Tecnica International (STI) with Ryuichiro Kuze on 2 April 1988, established by Fuji Heavy Industries to consolidate the automaker's motorsport operations.
A single-sourced claim, preserved rather than discarded
A previously noted enthusiast-press claim — that Koseki founded a Japanese motorsport club in the late 1960s and personally raced a Subaru 360 — comes from a single, uncorroborated blog source. It does not conflict with the Wikipedia account, but Wikipedia does not corroborate it either, so it is preserved here as a provisional detail rather than promoted to settled fact or discarded. Koseki's birth/death dates and any career before 1971 remain unresearched; his full biography, including any later STI/rally-program role, is left to future motorsport-focused research.