7/06–Pres.  –  Lucille  P.  Markey  Distinguished  Professor  of  Arts  and  Sciences,  Departments  of   Biology  and  Chemistry,  Washington  University,  St.  Louis,  MO   7/08–Pres.  –  Secondary  Faculty  Appointment,  Department  of  Biochemistry  and  Molecular   Biophysics,  Washington  University,  St.  Louis,  MO   7/02–6/06  –  Chair,  Department  of  Chemistry  and  Biochemistry,  Arizona  State  University   7/88–6/06  –  Professor  of  Chemistry  and  Biochemistry,  Arizona  State  University   7/85–6/88  –  Associate  Professor  of  Chemistry,  Arizona  State  University,  Tempe,  AZ   7/79–6/85  –  Assistant  Professor  of  Chemistry,  Amherst  College,  Amherst,  MA   6/76–6/79  –  Postdoctoral  Fellow,  Department  of  Biochemistry,  University  of  Washington,   Seattle,  WA  with  Prof.  William  Parson   8/75–12/75  –  Assistant  Professor  of  Chemistry,  American  University  of  Beirut,  Beirut,   Lebanon   1/75–7/75  &  1/76–5/76  –  Postdoctoral  Fellow,  Lawrence  Berkeley  Lab.,  Berkeley,  CA,  with   Prof.  Kenneth  Sauer   6/70–12/74  –  Graduate  Student,  Department  of  Chemistry,  University  of  California,   Berkeley,  CA,  Prof.  Kenneth  Sauer,  Advisor