Two operators who put their own names on every note.
Will Karstetter
William Karstetter was born and raised in Bixby, Oklahoma, where he still lives today. He studied entrepreneurship at the University of Oklahoma (2013-2017), but he'd been building businesses long before that. As a sophomore in high school he coded and launched an online auction that pulled in 3,000 members nationwide in its first two weeks, all organic. Through college he tried everything a restless builder tries: e-commerce, a car-media YouTube channel with a hundred-plus videos, buying and selling furniture at scale out of a rented storage unit.
After graduating he took a sales job at a Tulsa HVAC company, and hated feeling stuck. In 2017 a friend introduced him to real estate. Will went all in: at the office by 5 a.m. reading Bigger Pockets, taking every full-time investor he could find to lunch, and sending his first direct-mail letters on September 1, 2017, his birthday. He contracted his first house that same month. A few months later he closed on a 48-lot mobile home park in Ponca City, and turned it around by doing the work himself. That relentless, roll-up-your-sleeves approach became the DNA of everything Spark has built since. His why is simple: real estate let him lean into the person he was built to become, and create value for his family, his team, and the Tulsa community along the way.
Sam Sendgraff
Samuel Sendgraff was born in Dallas and grew up in Cleveland, Texas, where he graduated high school before earning an engineering degree from LeTourneau University in Longview. He started his career as an engineer, working outages at nuclear power plants, including the Tennessee Valley Authority's Sequoyah plant near Soddy-Daisy, Tennessee and Comanche Peak in Glen Rose, Texas, then moved to Tulsa in 2011 for an oil and gas role at SCFM Compression Systems.
The engineering paid well but bored him, so he started studying the Tulsa housing market and bought his first house in 2013. Within a couple of years he was well past ten homes and still growing, expanding into churches, RV parks, and commercial and industrial buildings. That engineer's eye, knowing exactly what a building needs and what it will cost, is the operational backbone of Spark. His reason for building is simple: the more he makes, the more he can give away. Sam is a personal guarantor on every Sparos note. Outside of work, you'll usually find him fishing, hunting, or on the water.
