The roads that wind around the airport in Moshi, Tanzania, are flanked by fields of maize standing at attention like silent guards in the moonlight. The houses have corrugated metal roofs and lights glowing in the windows. Everything seems a little tucked away, like so many well-kept secrets waiting to be discovered. This town is home to an American family—Dr. Susan Lewallen; her husband, Dr. Paul Courtright; and their two young boys. She is an ophthalmologist and he has a graduate degree in public health. The couple have worked in Africa for over 15 years and first visited Aravind in 2002 for guidance on an ambitious project—they were building a LAICO equivalent in the little town of Moshi.

Lewallen and Courtright ...

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