This issue of Immunology and Allergy Clinics, guest edited by Drs. Linda S. Cox and Anna H. Nowak-Wegrzyn, is devoted to Aeroallergen and Food Immunotherapy. Articles in this issue include History of AIT and the future direction of CRD/molecular allergy; Mechanisms of aeroallergen allergen immunotherapy: SCIT and SLIT; Mechanisms underlying induction of tolerance to foods; Biomarkers for allergen immunotherapy; SCIT and SLIT; Novel delivery routes for allergy immunotherapy; Oral immunotherapy for food allergy; SLIT and EPIT for food allergy; The use of adjuvants for enhancing allergen immunotherapy efficacy; Allergen immunotherapy vaccine modification; Allergen immunotherapy outcome assessment in clinical trials and real life; Component resolved diagnosis: can it make specific AIT more specific?; Baked milk and egg diets for milk and egg allergy management; and Allergen immunotherapy practical considerations: adherence and strategies to improve.