▁the ▁XIII ▁International ▁Botan ical ▁Congress ▁in ▁ 1 9 8 1 . ▁He ▁has ▁served ▁as ▁Vice - ra pp orte ur ▁and ▁R app orte ur - general ▁for ▁several ▁botan ical ▁con gress es , ▁including ▁at ▁Melbourne ▁( 2 0 1 1 ). ▁As ▁an ▁editor ▁for ▁the ▁journal ▁Tax on , ▁he ▁is ▁involved ▁with ▁assess ing ▁propos als ▁to ▁con serve ▁and ▁reject ▁botan ical ▁names . ▁ ▁Career ▁summary ▁▁ 1 9 5 7 – 1 9 6 1 ▁he ▁was ▁success ively ▁lect urer ▁and ▁associate ▁lect urer ▁in ▁agricult ural ▁bot any ▁at ▁the ▁University ▁of ▁Reading ▁▁ 1 9 6 1 – 1 9 6 9 , ▁lect urer ▁at ▁the ▁University ▁of ▁Liverpool . ▁▁ 1 9 6 9 – 1 9 8 1 , ▁Plant ▁Research ▁Institute ▁of ▁Agricult ure ▁Canada ▁▁ 1 9 8 1 – 1 9 8 7 , ▁professor ▁of ▁bi ology ▁at ▁the ▁University ▁of ▁Ott awa ▁▁ 1 9 8 7 – 1 9 8 9 , ▁' Reg ius ▁K ee per ' ▁( direct or ) ▁of ▁the ▁Royal ▁Botan ic ▁Garden ▁Edinburgh ▁as ▁successor ▁to ▁Douglas ▁Mack ay ▁Hend erson ▁and ▁prede cess or ▁to ▁David ▁S . ▁In gram ▁▁ 1 9 8 9 , ▁Associ ate ▁Director ▁of ▁the ▁Royal ▁Ontario ▁Museum ▁in ▁Toronto ▁( Can ada ). ▁In ▁this ▁position ▁he ▁was ▁in ▁charge ▁of ▁the ▁collections ▁and ▁research ▁▁ 1 9 9 0 – 1 9 9 1