Jonathan Wells is no vertabrate embryologist. He failed to finish a B.S. in geology, got a Ph.D in religious education (in 1986), and in 1994 got a Ph.D in cell and molecular biology--not embryology.
I'm not standing up for Wells here but there is no reason why someone with a Ph.D. in cell and molecular biology couldn't be a vertebrate embryologist. Modern developmental biology, effectively embryology, is principally a discipline of cell and molecular biology.
TTFN,
WK