Starting as an international outdoor adventure guide, Kriegel made his way the classroom afterwards and has been teaching for the past 15 years. Having taught in New York City, San Francisco, Los Angeles and Berlin, Germany, Kriegel has taught all of the grades 1st -8th in monolingual, dual language, inclusion as also created and taught a Digital Arts program for a public Middle School in New York City. Otis was adjunct faculty at New York University and a guest speaker at The Bank Street College of Education, City College of New York, Touro College and others. An experienced presenter, Kriegel has spoken at numerous conferences and given workshops to hundreds of new and veteran teachers alike, as well as consulted with educational administrators and principals. He wrote Everything a New Elementary School Teacher REALLY Needs to Know (But Didn't Learn in College) (Free Spirit, 2013) and Starting School Right: How do I plan for a successful first week in my classroom? (ASCD Arias, 2016).