Fermilab scientist Sergei Striganov died March 25 of a sudden heart attack. He was a lab employee for almost 20 years, personally mentored by Nikolai Mokhov since his formative years as a theoretical physicist. He grew up as a physicist at the Institute for High Energy Physics (with Ph.D. in high-energy physics in 1992) and the Superconducting Super Collider. Sergei has an extensive record of theoretical and experimental work in physics, as well as his radiological calculations as part of the MARS Group in the Target Systems Department of Accelerator Division. Sergei contributed to most of the recent Fermilab accelerator projects and was an important part of the team. He will be missed by his family and colleagues.