Zack is best known from his You Tube alter ego Dr.Zack. He has been a flat earther since 2012. He comes from Spain and works as an project manager. He has been researching flat earth for many years and has done loads of research. He is involved in the many observations that have been carried out over the years. He has been in FECORE since the start. Online most knew him as Dr.Zack but he now goes by the name Decimal Z.