UDHS is also the oldest high school in Delaware County , having been established in 1895 . The school is a part of the Upper Darby School District . With a present population of about 4200 students and 300 faculty and staff, it is a very dense school. The population is also diverse, with over 55 nationalities represented. It offers Advanced Placement Program courses and many extra-curricular activities. It has a long-established athletic rivalry with neighboring Haverford High School, as well as a long standing football rivalry with Monsignor Bonner High School , located less than a block away. This high school was part of the inspiration for Tina Fey 's movie comedy Mean Girls .
- David MacAdam — Class of 1928
- --- Discoverer of ''MacAdam ellipses'', former head of image structure at Eastman Kodak Research Laboratory, former President of Optical Society Of America
- Kermit Gordon — Class of 1933
- --- Former trustee of the Ford Foundation and President of the Brookings Institution
- Peter Bernardino — Class of 1936
- --- National Wrestling Hall-of-Famer
- George Wackenhut — Class of 1937
- --- Founder of Wackenhut Corp , major security contractor
- Sterling Voltz — Class of 1939
- --- Research Scientist, Missile and Space Division of General Electric , listed in ''American Men of Science'', ''American Men and Women of Science'', ''Who’s Who in Science and Engineering'', and ''Who’s Who in the World''
- Lloyd Alexander — Class of 1940
- --- Fantasy writer, original author of the books upon which Disney's The Black Cauldron was based
- Robert H. Bedrossian — Class of 1942
- --- Research ophthalmologist and philanthropist
- Dick Boccelli — Class of 1942
- --- Drummer for Bill Haley & His Comets , singer for Jodimars , actor
- Jack Ramsay — Class of 1942
- --- NBA coach 1968–1987, Basketball Hall of Fame 1992, Seventh-winningest coach in NBA history
- Frank Videon — Class of 1942
- --- Cited by Time (magazine) as a top 10 US car dealer.
- Dot Germain Porter — Class of 1943
- --- Professional golfer, U.S.G.A. Amateur Champ in 1949, U.S.G.A. Senior Champ in 1977, 1980, 1981.
- William Wharton — Class of 1943
- --- Writer, author of Birdy, later made into An Award-winning Movie Of The Same Name directed by Alan Parker
- Warren E. Grupe — Class of 1951
- --- Clinical Professor of Pediatrics at the University of Virginia, mentor/teacher of two U.S. Surgeon Generals, Vice President for PROJECT HOPE, and Medical Director/ Executive Director of the International Center for the Health Sciences.
- Marty Stern — Class of 1954
- --- former Villanova University track coach
- Jim Croce — Class of 1960
- --- Singer-songwriter, one Number 1 album
- Carolyn "Bunny" Welsh — Class of 1961
- --- Sheriff of Chester County, Pennsylvania . One of only 22 female sheriffs in the US
- F. Joseph Loeper — Class of 1962
- --- Former majority leader of the Pennsylvania Senate
- Claudia Catania — Class of 1964
- --- Mezzo-soprano , performed with Plácido Domingo and Luciano Pavarotti
- Mario J. Civera, Jr. — Class of 1965
- --- Member of the Pennsylvania House of Representatives
- Cindy Dee Holms — Class of 1966
- --- Author, ''Red Balloons Fly High'', ''Slaying the Virus Villians'', and a ''A Third Serving of Chicken Soup For The Soul ''
- James J. Morris — Class of 1966
- --- Vice President, Engineering and Manufacturing for Boeing Commercial Airplanes
- Todd Rundgren — Class of 1966
- --- Top ten musician and award-winning record producer
- William M. DeCampli — Class of 1969
- --- Astrophysicist and Cardiothoracic Surgeon
- James D. Houston — Class of 1977
- --- Received Academy Award in 1991 for design and development of CAPS (Computer Animation Production System) .
- Tina Fey — Class of 1988
- --- Senior writer, Saturday Night Live . Scriptwriter and co-star, Mean Girls .
- Todd Rucci Class of 1988
- ---played for the New England Patriots
- Heather Donahue — Class of 1991
- --- Star of The Blair Witch Project and Taken .
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