My very first student, way back in 1995, when I began writing the Guarani text, was James Arritt. Though he's no longer in Paraguay, Paraguay is still in him, as evidenced by his website offering yerba mate for sale.
Subsequent students now working in rural Paraguay include Jeff and Amy McKissick, who operate a mobile medical clinic in the village of San Francisco; Tom and Kelly Stout, who also work in rural Paraguay, though they're currently in the U.S. (check out this exciting project that the McKissicks and the Stouts are involved in!); John Griffin, in Tobati, and Paul and Marla Fields, who direct the work of ABWE in Paraguay. Their daughter, Shellie Silva, studied with us in the same class--she's married to a Guarani speaker. Another ABWE missionary, Laura Fouser, is now located across the border in Campo Grande, Brazil, having learned Spanish, Guarani, and now Portuguese. A short-termer from the International Mission Board of the Southern Baptist Church named Tonya VanKampen has since married and lives with her husband Kris Dixon in the U.S., though by the looks of their blog they're still very involved in missions!
Other former students who don't seem to have blogs include Dan and Sarah Hough, who live in Caazapá; Gil and Renita Rempel, in Campo 9; Erna Plett and Esther Goertzen, in Caaguazú (the Rempels, Erna, the Goertzens, and the Zachariases are all members of the Evangelical

My current class has four students: Greg Cameron (his wife Vonnie studied last year), Travis and Rosey Zacharias, and my wife Lizet. Here's the current class: L to R; Travis, our language helper Norma, Greg, Lizet, and Rosey.
The best I can tell, I've had 28 missionaries study with me since the Guarani institute opened in 2000. I've invested in their lives and now they are investing in the lives of countless others using the resource of Guarani.