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**Deirdre Longacher Smeltzer** (born 1964)^{[1]} is an American mathematician, mathematics educator, textbook author, and academic administrator. A former professor, dean, and vice president at Eastern Mennonite University, she is Senior Director for Programs at the Mathematical Association of America.^{[2]}

Smeltzer was a mathematics major at Eastern Mennonite University, graduating in 1987 with a minor in Bible study. At Eastern Mennonite, mathematicians Millard Showalter and Del Snyder became faculty mentors, encouraging her to continue in advanced mathematics.^{[3]} She went on to graduate study in mathematics at the University of Virginia, earning a master's degree^{[3]} and completing her Ph.D. in 1994, with the dissertation *Topics in Difference Sets in 2-Groups* on difference sets in group theory, supervised by Harold Ward.^{[4]}

She became a faculty member at the University of St. Thomas, a Catholic university in Saint Paul, Minnesota,^{[3]}^{[5]} before returning to Eastern Mennonite University as a faculty member in 1998.^{[5]} She chaired the mathematical sciences department from 2005 to 2012.^{[3]}
As an undergraduate at Eastern Mennonite, she had participated in a cross-cultural visit to China,^{[5]} and as a faculty member, she led another such visit in 2013,^{[5]}^{[6]} and became director of cross-cultural programs for the university. In 2013, she was named the university's vice president and undergraduate dean.^{[3]}
In that position, she led the university's creation of new programs in political science and global studies,^{[7]} among others.^{[5]}

She stepped down from her administrative positions at Eastern Mennonite in 2019,^{[5]} and joined the Mathematical Association of America as Senior Director for Programs in 2020.^{[2]}

Smeltzer is the coauthor of two undergraduate textbooks in mathematics: *Methods for Euclidean Geometry* (with Owen Byer and Felix Lazebnik, Mathematical Association of America, 2010)^{[8]} and *Journey into Discrete Mathematics* (with Owen Byer and Kenneth Wantz, MAA Press, 2018).^{[9]}

**^**Birth date from Library of Congress catalog entry, retrieved 2022-03-10- ^
^{a}^{b}"Deirdre Longacher Smeltzer",*Staff directory*, Mathematical Association of America, retrieved 2022-03-10 - ^
^{a}^{b}^{c}^{d}^{e}Lofton, Bonnie Price (8 April 2013), "Deirdre Smeltzer Named V-P and Undergrad Dean",*EMU News*, Eastern Mennonite University, retrieved 2022-03-10 **^**Deirdre Smeltzer at the Mathematics Genealogy Project- ^
^{a}^{b}^{c}^{d}^{e}^{f}Kurtz, Christopher Clymer (16 May 2019), "Mutual impact: 'Wonderful and wise' Deirdre Longacher Smeltzer was changed by – and changed – EMU",*EMU News*, Eastern Mennonite University, retrieved 2022-03-10 **^***China cross-cultural takes students out of comfort zones*, Augusta Free Press, 30 October 2012, retrieved 2022-03-10**^**Kline, Jared (1 April 2019), "EMU to launch new programs of study",*WHSV News*, retrieved 2022-03-10**^**Reviews of*Methods for Euclidean Geometry*:- Black, Chris (December 2011 – January 2012),
*The Mathematics Teacher*,**105**(5): 398, doi:10.5951/mathteacher.105.5.0396, JSTOR 10.5951/mathteacher.105.5.0396`{{citation}}`

: CS1 maint: untitled periodical (link) - Doherty, Ruth (December 2010), "Review",
*MAA Reviews* - Hajja, Mowaffaq,
*zbMATH*, Zbl 1223.51021`{{citation}}`

: CS1 maint: untitled periodical (link)

- Black, Chris (December 2011 – January 2012),
**^**Kurtz, Christopher Clymer (6 December 2018), "The story of an 'exquisite' new discrete math textbook by EMU's Owen Byer and Deirdre L. Smeltzer",*EMU News*, Eastern Mennonite University, retrieved 2022-03-10