Reginald was educated at St Bartholomew's Hospital, where he took the diplomas of M.R.C.S., L.R.C.P. in 1892, and the degree of M.D. in 1913. After acting as house-surgeon of Birmingham General Hospital, and as senior resident medical officer of the Scamen's Hospital, Royal Albert Docks, he went into practice at Kenilworth, where he was honorary medical officer to Kenilworth Convalescent Homes, and certifying factory surgeon. Reginald entered the war in France in November 1914, and served as surgeon to the Lady Sykes's French Red Cross Hospital at Dunkirk. He held a commission as temporary major in the R.A.M.C.