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Todd A. Fonseca: the engineer who wrote the cavern

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1966 –

The tie, exactly: Todd A. Fonseca was born October 3, 1966, in Mishawaka. The record beyond his own published biography is thin, and the entry prints thin: his Aaron and Jake time-travel books grew, on his own account, out of a childhood spent growing up near the Amish communities of northern Indiana — a formation claim in his own words, printed as his own words.

The course, at documented size: Fonseca took a bachelor's degree in electrical engineering and a master's in biomedical engineering at Marquette University, and his working life is in medical technology: he lives in Andover, Minnesota, and serves as a vice president of clinical research and technical communications at Medtronic. Alongside it he wrote juvenile fiction: The Time Cavern, first self-published in June 2008 and reissued by Ridan Publishing in 2009, in which a city boy moved to Amish country finds a time machine behind a century-old disappearance; and the sequel, The Inverted Cavern (2011). The Mishawaka-born engineer's two small books are the whole of his public record, and they stand here at that size.

Sources:

  1. Wikipedia, "Todd A. Fonseca," read November 2026 (birth at Mishawaka; Marquette degrees; Medtronic office; the books)
  2. WorldCat catalog record, The Time Cavern (2008 first edition)

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Using this page? Copy a credit line. Last updated November 12, 2026.

Source: Todd A. Fonseca: the engineer who wrote the cavern, Moosed History by Project Moosed, https://history.projectmoosed.com/usa/midwest/indiana/mishawaka/people/todd-a-fonseca-the-engineer-who-wrote-the-cavern/