# Carl B. Allendoerfer Award

The Carl B. Allendoerfer Award is presented annually by the Mathematical Association of America (MAA) for "expository excellence published in Mathematics Magazine." it is named after mathematician Carl B. Allendoerfer who was president of the MAA 1959–60.

## Recipients

Recipients of the Carl B. Allendoerfer Award have included:
| Recipient | Year | Article |
| John Chase and Matthew Wright | 2024 | Bacterial Growth: Not So Simple |
| Alissa S. Crans and Glen T. Whitney | 2024 | Integral Tiling Pentagons |
| Tien Chih and Demitri Plessas | 2023 | A Search for Champion Boxers |
| Steven J. Brams and Peter S. Landweber | 2023 | Three Persons, Two Cuts: A New Cake-Cutting Algorithm |
| David Hunter and Chisondi Warioba | 2022 | Segregation Surfaces |
| Kaity Parsons, Peter Tingley and Emma Zajdela | 2022 | When to Hold ‘Em |
| Nancy Ho, James Godzik, Jennifer Jones, Thomas W. Mattman, and Dan Sours | 2021 | Invisible Knots and Rainbow Rings: Knots Not Determined by Their Determinants |
| Jocelyn R. Bell and Frank Wattenberg | 2021 | The Slippery Duck Theorem |
| Beth Malmskog and Kathryn Haymaker | 2020 | What (Quilting) Circles Can Be Squared? |
| Juan Arias de Reyna, David Clark, and Noam Elkies | 2020 | A Modern Solution to the Gion Shrine Problem |
| William Dunham | 2019 | The Early (and Peculiar) History of the Möbius Function |
| Jordan Bell and Viktor Blåsjö | 2019 | Pietro Mengoli’s 1650 Proof that the Harmonic Series Diverges |
| Fumiko Futamura and Robert Lehr | 2018 | A New Perspective on Finding the Viewpoint |
| Brian Conrey, James Gabbard, Katie Grant, Andrew Liu, and Kent Morrison | 2017 | Intransitive Dice |
| Vladimir Pozdnyakov and J. Michael Steele | 2017 | Buses, Bullies, and Bijections |
| Julia Barnes, Clinton Curry, Elizabeth Russell, and Lisbeth Schaubroeck | 2016 | Emerging Julia Sets |
| Irl Bivens and Ben Klein | 2016 | The Median Value of a Continuous Function |
| Daniel Heath | 2015 | Straightedge and Compass Constructions in Spherical Geometry |
| Andrew Beveridge and Stan Wagon | 2015 | The Sorting Hat Goes to College |
| Sally Cockburn and Joshua Lesperance | 2014 | Deranged Socks |
| Susan Marshall and Donald Smith | 2014 | Feedback, Control, and Distribution of Prime Numbers |
| Khristo N. Boyadzhiev | 2013 | Close Encounters with the Stirling Numbers of the Second Kind |
| Adrian Rice and Ezra A. Brown | 2013 | Why Ellipses Are Not Elliptic Curves |
| P. Mark Kayll | 2012 | Integrals Don't Have Anything to Do with Discrete Math, Do They? |
| John A. Adam | 2012 | Blood Vessel Branching: Beyond the Standard Calculus Problem |
| Curtis D. Bennett, Blake Mellor, and Patrick Shanahan | 2011 | Drawing a Triangle on the Thurston Model of Hyperbolic Space |
| Gene Abrams and Jessica Sklar | 2011 | The Graph Menagerie: Abstract Algebra and the Mad Veterinarian |
| David Speyer and Bernd Sturmfels | 2010 | Tropical Mathematics |
| Ezra Brown and Keith Mellinger | 2010 | Kirkman's Schoolgirls Wearing Hats and Walking Through Fields of Numbers |
| Jeff Suzuki | 2009 | A Brief History of Impossibility |
| Vesna Stojanoska and Orlin Stoytchev | 2009 | Touching the Z2 in Three-Dimensional Rotations |
| Chris Christensen | 2009 | Polish Mathematicians Finding Patterns in Enigma Messages |
| Eugene Boman, Richard Brazier, and Derek Seiple | 2008 | Mom! There's an Astroid in My Closet! |
| Saul Stahl | 2008 | The Evolution of the Normal Distribution |
| Carl V. Lutzer | 2007 | Hammer Juggling, Rotational Instability, and Eigenvalues |
| Jeff Suzuki | 2006 | The Lost Calculus (1637-1670): Tangency and Optimization without Limits |
| Robb T. Koether and John K. Osinach, Jr. | 2006 | Outwitting the Lying Oracle |
| Roger B. Eggleton and William P. Galvin | 2005 | Upper Bounds on the Sum of Principal Divisors of an Integer |
| Charles I. Delman and Gregory Galperin | 2004 | A Tale of Three Circles |
| Ezra Brown | 2003 | The Many Names of (7,3,1) |
| Dan Kalman | 2003 | Doubly Recursive Multivariate Automatic Differentiation |
| Mark McKinzie and Curtis Tuckey | 2002 | Higher Trigonometry, Hyperreal Numbers, and Euler's Analysis of Infinities |
| James N. Brawner | 2001 | Dinner, Dancing, and Tennis, Anyone? |
| Raphael Falk Jones and Janice L. Pearce | 2001 | A Postmodern View of Fractions and the Reciprocals of Fermat Primes |
| Donald Teets and Karen Whitehead | 2000 | The Discovery of Ceres: How Gauss Became Famous |
| Donald G. Saari and Fabrice Valognes | 1999 | Geometry, Voting, and Paradoxes |
| Victor Klee and John R. Reay | 1999 | A Surprising but Easily Proved Geometric Decomposition Theorem |
| Dan Kalman, Robert Mena, and Shahriar Shahriari | 1998 | Variations on an Irrational Theme-Geometry, Dynamics, Algebra |
| Lin Tan | 1997 | The Group of Rational Points on the Unit Circle |
| Colm Mulcahy | 1997 | Plotting and Scheming with Wavelets |
| Daniel J. Velleman and Gregory S. Call | 1996 | Permutations and Combination Locks |
| Judith Grabiner | 1996 | Descartes and Problem-Solving |
| Tristan Needham | 1995 | The Geometry of Harmonic Functions |
| Lee Badgett | 1995 | Lazzarini's Lucky Approximation of pi |
| Joan P. Hutchinson | 1994 | Coloring Ordinary Maps, Maps of Empires, and Maps of the Moon |
| Xun-Cheng Huang | 1993 | From Intermediate Value Theorem to Chaos |
| David Logothetti | 1992 | Cube Slices, Pictorial Triangles, and Probability |
| Israel Kleiner | 1992 | Rigor and Proof in Mathematics: A Historical Perspective |
| Gulbank D. Chakerian | 1992 | Cube Slices, Pictorial Triangles, and Probability |
| Ranjan Roy | 1991 | The Discovery of the Series Formula for π by Leibniz, Gregory, and Nilakantha |
| Ronald L. Graham | 1990 | |
| Martin Gardner | 1990 | |
| Fan Chung | 1990 | Steiner Trees on a Checkerboard |
| Thomas Archibald | 1990 | Connectivity and Smoke-Rings: Green's Second Identity in Its First Fifty Years |
| Kenneth C. Millett | 1989 | |
| W.B. Raymond Lickorish | 1989 | The New Polynomial Invariants of Knots and Links |
| Judith Grabiner | 1989 | The Centrality of Mathematics in the History of Western Thought |
| Steven Galovich | 1988 | Products of Sines and Cosines |
| Bart Braden | 1988 | Pólya's Geometric Picture of Complex Contour Integrals |
| Paul Zorn | 1987 | The Bieberbach Conjecture |
| Israel Kleiner | 1987 | The Evolution of Group Theory: A Brief Survey |
| Saul Stahl | 1986 | The Other Map Coloring Theorem |
| Bart Braden | 1986 | Design of an Oscillating Sprinkler |
| Philip D. Straffin, Jr. | 1985 | Parliamentary Coalitions: A Tour of Models |
| Bernard Grofman | 1985 | |
| Frederick S. Gass | 1985 | Constructive Ordinal Notation Systems |
| Judith Grabiner | 1984 | The Changing Concept of Change: The Derivative from Fermat to Weierstrass |
| Clifford Wagner | 1983 | A Generic Approach to Iterative Methods |
| Donald Koehler | 1983 | Mathematics and Literature |
| Marjorie Senechal | 1982 | Which Tetrahedra Fill Space? |
| J. Ian Richards | 1982 | Continued Fractions without Tears |
| Donald E. Sanderson | 1981 | Advanced Plane Topology from an Elementary Standpoint |
| Stephen B. Maurer | 1981 | The King Chicken Theorems |
| Ernst Snapper | 1980 | The Three Crises in Mathematics: Logicism, Intuitionism, and Formalism |
| Victor Klee | 1980 | Some Unsolved Problems in Plane Geometry |
| Doris Schattschneider | 1979 | Tiling the Plane with Congruent Pentagons |
| Bruce C. Berndt | 1979 | Ramanujan's Notebooks |
| David A. Smith | 1978 | Human Population Growth: Stability or Explosion? |
| Geoffrey C. Shephard | 1978 | Tilings by Regular Polygons |
| Branko Grünbaum | 1978 | |
| B.L. van der Waerden | 1977 | Hamilton's Discovery of Quaternions |
| Joseph A. Gallian | 1977 | The Search for Finite Simple Groups |