DOYLESTOWN, PA—David Sohmer Svahn, retired physician and educator, has died. He was 84 years old. David lived most recently in Doylestown, Bucks County, Pennsylvania, having moved from Cooperstown, New York in 2009 where he had lived for 37 years. David is survived by his wife of nearly 60 years, Karin Elmqvist Svahn; his three children, Anna and Jennifer (husband Jeff Nicastro), both of New York City, and Jonathan (wife Tiffany Svahn) of Orinda, California. David also leaves four beloved grandchildren,…