9 2 , ▁living ▁at ▁ 7 ▁Man or ▁Place , ▁and ▁was ▁then ▁appointed ▁assistant ▁phys ician ▁to ▁the ▁skin ▁department ▁of ▁the ▁Royal ▁Inf irm ary ▁of ▁Edinburgh ▁under ▁All an ▁Jam ies on , ▁until ▁ 1 9 0 6 . ▁When ▁the ▁latter ▁retired , ▁Walker ▁became ▁phys ician ▁in ▁charge ▁of ▁the ▁skin ▁w ards ▁from ▁ 1 9 0 6 ▁to ▁ 1 9 2 4 , ▁and ▁consult ant ▁phys ician ▁from ▁ 1 9 2 5 ▁to ▁ 1 9 4 2 . ▁Additionally , ▁Walker ▁gave ▁lect ures ▁on ▁dise ases ▁of ▁the ▁skin ▁at ▁the ▁University ▁of ▁Edinburgh ▁and ▁at ▁the ▁royal ▁colleg es , ▁and ▁had ▁a ▁private ▁practice ▁as ▁well ▁as ▁a ▁special ▁clin ic ▁to ▁treat ▁l up us ▁vul gar is , ▁which ▁he ▁continued ▁after ▁he ▁retired . ▁ ▁Walker ▁was ▁involved ▁in ▁a ▁number ▁of ▁academic ▁and ▁medical ▁organis ations , ▁making ▁an ▁impact ▁on ▁medical ▁services ▁in ▁Scotland ▁and ▁in ▁the ▁world . ▁He ▁was ▁elected ▁fellow ▁of ▁the ▁Royal ▁College ▁of ▁Phys icians ▁of ▁Edinburgh ▁in ▁ 1 8 9 2 , ▁and ▁was ▁tre as urer ▁from ▁ 1 9 0 8 ▁to ▁ 1 9 2 9 , ▁and ▁president ▁from ▁ 1 9 2 9 ▁to ▁ 1 9 3 1 . ▁He ▁was ▁also ▁directly ▁elected ▁representative ▁of ▁Scottish ▁pract ition ers ▁on ▁the ▁General ▁Medical ▁Council ▁from ▁ 1 9 0 6 ▁to ▁ 1 9 4 1 ▁( Pres