Diederik has over 25 years of experience as a teacher, admissions director, and private school college counselor.

In addition to advising national and international families on relocation, day, boarding school, and college placements, Diederik has extensive experience working with students who require special needs and alternative schools or interventions and therapeutic settings. This intensive, time-sensitive work has earned him the respect of hundreds of therapists, school counselors, clients, programs, and schools.

After each original placement, Diederik follows up in person by phone, mail, and email to monitor the progress of his students—assuring the appropriateness of the placement, and helping the family and student prepare for the next step. Because this process usually includes multiple stages, Diederik develops and nurtures ongoing relationships with his clients.

Diederik has lived and studied abroad, and also specializes in helping international families find appropriate school and college settings for their children. Diederik has been, and is, a frequent presenter and participant at professional conferences, and his memberships include NATSAP, SSATB, NACAC, and other professional organizations.