AFAIK the 2000B was the first Amiga thing he worked on (redesigning the 2000A with A500's chipset). Just imagine the progress he made in two short years 88-90!
from wik:
He started work at Commodore in 1983 as an engineer under Bil Herd. His first project was to help complete the TED systems comprising Plus/4, C16 and more. After completing the Commodore 128 Bil Herd left the company and Dave Haynie was promoted to chief engineer in the low-end group. After Commodore acquired Amiga, Dave Haynie ended up primary engineer on the expandable A2000 computer. Later, he joined Bob Welland on the A2620 CPU module, and launched the follow-up A2630 the year thereafter. These were delivered in the A2500/20 (1989) and A2500/30 (1989).[citation needed]
In 1989 he started designing the Zorro III expansion bus architecture, and in 1990, with Greg Berlin, Hedley Davis, Jeff Boyer, and Scott Hood, created the Amiga 3000.[citation needed]
On completing the A3000 he was transferred to advanced projects, working with Bob Raible on the "AA" system (formerly "Pandora"), Commodore's first full 24-bit color computer technology, which led to the A3000+ prototype, and ultimately to A4000 and A1200 computers,
he started back in '83 and worked on:
plus/4,
c16,
c128,
a2000,
a2620,
2500/20,
a2500/30,
a3000,
a3000+,
a4000,
a1200,
andAAA
so he started in '83 left in '94 and worked on many of the computers commodore made,
pretty talented guy!