Mark DeWitt LanyonMark DeWitt Lanyon's career in behavioral health was launched when he was studying for his Master of Human Services degree at Lincoln University (LU '98). During his career, Mark supervised and/or directed behavioral health programs in settings such s the prison system, probation and parole system, hospitals and inpatient and outpatient behavioral health treatment programs. Since retiring, Mark has been able to focus on research about Chester County. His research resulted in his book Abolition and the Underground Railroad in Chester County, Pennsylvania . His latest book, Lost Chester County, Pennsylvania, explores the forgotten history of Chester County. Read More Read Less