 Complete the following phrase:  In 1860, he was awarded the title Photographer of Their Imperial Majesties, which allowed him to place the state emblem on his signboard. Three years later, he moved to an even larger studio, which he would operate until his death. During this time, he began participating in numerous national and international exhibitions. In 1865, he was elected a member of the Société française de photographie. Several artists and photographers who would later become famous worked as retouchers in his studio, including Ivan Kramskoi and . The catalogue of the works he presented at the 