MR2390085 (2008m:35240) Fang, Daoyuan; Wang, Chengbo Ill-posedness for semilinear wave equations with very low regularity. Math. Z. 259 (2008), no. 2, 343--353.
Citation 0

MR2231083 (2007c:35096) Fang, Daoyuan; Wang, Chengbo Some remarks on Strichartz estimates for homogeneous wave equation. Nonlinear Anal. 65 (2006), no. 3, 697--706.
Citation 1

MR2158491 (2006c:35188) Fang, Daoyuan; Wang, Chengbo Local well-posedness and ill-posedness on the equation of type $\square u=u\sp k(\partial u)\sp {\alpha}$. Chinese Ann. Math. Ser. B 26 (2005), no. 3, 361--378.
Citation 1 (by themself)

It is unbelievable that with such a publication list
he could be an assistant Professor. I guess that he is a
postdoc.