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L. Charles (Chuck) Biehl (born October 3, 1952) is a secondary math education specialist based in North East, Maryland. He has been a teacher of mathematics since 1977, and since 2014 he has been an independent instructor and curriculum consultant. He is a former STEM administrator and a strong proponent of discrete mathematics, which he has also taught in and out of the classroom. He is most closely associated with the Charter School of Wilmington in Wilmington, Delaware, for which he was a founding faculty member, and where he taught from 1996, the year the school opened, until 2011. He then became part of a special academic program at the Charter School until 2014.

Early life and family
Biehl was born in Norristown, Pennsylvania to L. Charles (Charlie) Biehl, Sr. (1918-2002), a businessman, civic leader and school board president, and Francis M. (née Dunlap) Biehl (1924-2005) , a homemaker active in the community. He has a brother, Jeffrey, is married to married to Peggy J. (nee MacQueen) Biehl and they have two sons, Joshua and Jared.

Biehl graduated from the University of Delaware in 1975, earning a bachelor’s degree in mathematics secondary education. He earned a master’s degree in education administration from LaSalle University in 1996.

Career
Biehl’s first job was at Duncan Road Academy in Wilmington, Delaware, where he taught math and counseled troubled youth from 1976 to 1979. Biehl then taught math and computer science at North East High School in Maryland from 1979 to 1991. Biehl’s life as a teacher was forever changed in the summer of 1990 when he attended a four-week leadership institute in discrete math at Rutgers University. This experience led to his first publication of a monograph in a book called Discrete Mathematics in the Schools. Biehl spent the next three years teaching math and computer science at Thomas McKean High School in Delaware, where he was among the first instructors to introduce discrete math at the high school level. He also implemented a computer-based learning center, which was still new at the time.

After spending two years as the Dean of the Academy of Math and Science at the now-closed Wilmington High School, Biehl joined the brand-new Charter School of Wilmington in the fall of 1996. He taught math there and was the Dean of Math, Science and Technology until 2002, when he chose to return to the classroom full-time. From 2005 to 2008, Biehl authored numerous materials for students and teachers as part of an educational program that utilized mathematics shown on the CBS crime drama series NUMB3RS. The program was sponsored by Texas Instruments and the National Council of Teachers of Mathematics, and both production and cast members from the show partnered with Biehl and other authors at regional and national conferences in support of the program. Biehl gave several presentations at these conferences, which were called “NUMB3RS in Your Classroom”. From 2011 to 2014, Biehl transitioned into an education outreach role for the Charter School, conducting research, running a speakers’ series and heading a student/teacher exchange with Kaohsiung Municipal Fu Cheng Senior High School in Kaohsiung, Taiwan.

Since leaving the Charter School in 2014, Biehl has continued as an independent education consultant, supporting an alignment with the Common Core State Standards Initiative. He also writes, reviews and edits education materials and journal articles for a number of publishing firms.

From 1991 to 2012, Biehl was a lead teacher, content specialist and researcher for the Center for Discrete Mathematics and Theoretical Computer Science (DIMACS) at Rutgers University. As part of a team of four, he gave workshops, assisted college professors with presentations, demonstrated sample lessons and helped teacher attendees to learn new mathematics and develop appropriate middle and high school curriculum materials.

Biehl continues to give presentations at annual conferences hosted by the California Mathematics Council (CMC) and other professional organizations. He presents on a variety to topics within the areas of algebra, geometry, precalculus and discrete math.

Musical career
In 1975, Biehl learned to play and construct the mountain dulcimer and the unrelated hammered dulcimer. He went on to give live performances at various art shows, fairs, and festivals, and teach others to play, both in the United States and during an extended trip to southern England in 1984. He released an album of hammered and mountain dulcimer music called Some for Love and Some for Laughs in 1983. In 1979, he partnered with fellow player and fine instrument craftsman Bill Keay. They formed a duo/business called Elk Neck Dulcimers, performing at art festivals and craft shows. Their efforts earned them several awards for workmanship.

In 2018, Biehl released a special 35th anniversary remastered cd edition of Some for Love and Some for Laughs, which included two previously unreleased tracks and a 1984 interview Biehl gave on BBC Radio in Bristol, England. Tracks from the album found on YouTube.

Awards and Recognitions
In 1992 Biehl was the Delaware mathematics recipient of the Presidential Award for Excellence in Mathematics and Science Teaching (PAEMST), representing Delaware at the White House as part of a weeklong commemoration in Washington, DC. In 1994 he was one of 100 recipients of the Tandy Prize for Excellence in Mathematics, Science, and Computer Science Teaching.

That same year, Biehl received the “Superstars! In Education” award for implementation of C.A.L.C. (Computer Assisted Learning Center) by the Delaware Chamber of Commerce.

He was also recognized by institutions of higher learning. He received the Excellence in Teaching Award from the Science Alliance of Delaware for the 1998-99 school year. In 2003, the University of Delaware Alumni Association presented Biehl with the Commitment to Educational Excellence Award.

Publications
“The Facility Location Problem: Just the Beginning”, ComMuniCator, Volume 42, No. 3, March 2018, pp. 21-33.

-Mathematics Advisory Panel, “Flatland the Movie” DVD, produced by Seth Caplan, 2008.

“Curve Fitting With the Bubble Board”, with A. Hammons et. al, Ohio Journal of Mathematics, Volume 66, No. 12, Fall 2012.

Author of several classroom activities to support the CBS crime drama NUMB3RS, working jointly with/for NCTM and Texas Instruments, published on CBS website from September 2005 through May 2007

“Massive Graphs, Power Laws, and the World Wide Web”; The Mathematics Teacher; Volume 96, Number 6; September 2003; pp. 434-46.

“Forest Fires, Oil Spills, and Fractal Geometry: An Investigation in Two Parts”; “Part 2: Natural Phenomena and Fractal Complexity”; The Mathematics Teacher; Volume 92 Number 2; February, 1999; pp. 128-39.

“Forest Fires, Oil Spills, and Fractal Geometry: An Investigation in Two Parts”; “Part 1:Cellular Automata and Modeling Natural Phenomena”; The Mathematics Teacher; Volume 91 Number 8; November, 1998; pp. 682-7.

“Discrete Mathematics in the Classroom: A Fresh Start for Secondary Students”; Discrete Mathematics: Impact in the K - 12 Curriculum; The Mathematical Association of America; 1997; pp. 317-22.