X0206 3 2018-06-20 1 0001681087 AVROBIO, Inc. AVRO 0001238120 Donenberg Phillip B. C/O AVROBIO, INC. 1 KENDALL SQUARE, BUILDING 300, STE 201 CAMBRIDGE MA 02139 1 0 0 0 Exhibit 24 - Power of Attorney /s/ Phillip Donenberg 2018-06-20