Alexander is a history teacher with a long track record of success with multiple exam boards (Cambridge and CollegeBoard). He has over 15 years of teaching experience, helping students achieve best in country (China) results in both IGCSE and A Level as well as above the world average for top marks (5) in AP US History. His graduated with a Master's degree from Middlebury College and did his teacher training with the University of Nottingham. His teaching focus is on igniting a passion for learning in his students, and equipping them with the critical thinking and analytical skills to navigate information and come to reasoned, logical conclusions. Dozens of Mr. Lennartz's students have gone on to study at Oxbridge. Many others have gone onto other prestigious universities in the UK and the USA, such as LSE, Imperial, Stanford, NYU, Carnegie-Mellon, University of Pennsylvania, Vanderbilt and many others over the years. He currently resides in his home state of Pennsylvania and has his own educational YouTube channel, Purple Shirt History.