The instructor is the one who teaches you to dive. The dive center only provides the structure. Your instructor is the key element of your course. Your instructor is the one who will take care of you in the water. At IFDI, we value this human being. We register the instructors rather than the dive centers. So, we don't have a list of dive center to display.
But, you need to know that 99% of the diving instructors are holding a diploma that meets the ISO standard: ISO 24802-2. All these instructors can become IFDI instructors. They simply need to register themselves at IFDI. So, you may ask for an IFDI course in any dive center of your choice. As simple as that.