 ArizMATYC Conference (Phoenix, AZ), Friday October 5, 2018. [Links]
"Making Sense of Integration Visually:
Mapping Diagrams for Calculus"
"Solving Polynomial Equations: Visualization from Linear to Cubic, from Rational to Complex Numbers".
HSU Math Department Colloquium,"How
Many Ways Can You Solve a Quadratic Equation Visually? From the
Greeks to 21st Century Technology." Sept. 13, 2018.[Links]
British Congress of Mathematics
Education 9, [Sessions A20, D20, E20, H20] April 36, 2018, University of
Warwick. [Links]
Informal Proceedings 13 Mapping Diagrams: Four Sessions, One Theme. Using Mapping Diagrams in Algebra, Calculus, and Complex Analysis
Sacramento Valley Community College Mathematics (SVCCM) Conference, American River College (Sacramento), "Solving Polynomials: Mapping Diagram Visualization", Saturday, March 3, 2018.[Links]
Joint Mathematics Meetings San Diego, CA, Jan. 13, 2018:
"Mapping Diagrams Visualizing Functions and Equation
Solutions: From Algebra Basics to Real and Complex
Analysis." AMS
Special Session on Visualization in Mathematics: Perspectives of
Mathematicians and Mathematics Educators. [Links]
"Making Sense of Complex Integration: Mapping
Diagrams Created with GeoGebra to Visualize Definitions, Theory and
Applications." MAA Session on Revitalizing Complex Analysis [Links]
 Borderland Math Teachers Circle, U of AZ, South Campus, "Mapping (Function) Diagrams to Visualize and Make Sense of Solving Linear and Quadratic Equations," November 14, 201 7 [Links]
 AMATYC Conference, 2017, "Using Mapping Diagrams to Make Sense of Functions and Equations", November 11, 2017 [Links]
 Arizona State University, Mathematics Education Colloquium, "Making Sense of Calculus with Mapping Diagrams:A Visual Alternative to Graphs", November 3, 2017
 University of Arizona. Center for Recruitment and Retention of Mathematics Teachers, Workshop,
"Using Mapping Diagrams to Make Sense of Functions and Calculus," Part I, October 18, 2017. [Links I] Part II [Links II]
 HSU Math Department Colloquium, "Solving Polynomial Equations: Visualization from Linear to Cubic,from Rational to Complex Numbers", 9242017
 Links to Presentation "Making Sense of Functions with Mapping Diagrams: From Algebra Basics to Calculus" ATM 2017 Conference, April 12, 2017, StratfordonAvon, England.
 "Complex Variables: Mapping Diagrams for Visualizing Complex Arithmetic and Functions Dynamically with GeoGebra", ATM 2017 Conference, April 11, 2017, StratfordonAvon, England.
 Links to Presentation, "Making sense of solving equations visually using functions and mapping diagrams" Culture, Pedagogy and Identity Interest Group, Mathematics Education Centre, Loughborouogh University, March 29, 2017.
 Links to Sept./Oct. 2016 Presentations: Lecture Tour of Oregon, Washington, & Idaho
 Links to Presentations"Using Mapping Diagrams to Make Sense of Functions and Equations" ATM 2016 Conference, March 31, 2016,Warwick, England.
 "Mapping Diagrams for Complex Variable Functions Visualized Dynamically with GeoGebra" ICTCM 2016 March 12, 2016, Atlanta, GA.
 "Complex Variables: Mapping Diagrams for Visualizing Complex Arithmetic and Functions Dynamically with GeoGebra" HSU Mathematics Department Colloquium, March 3, 2016
 "Visualizing Complex Variable Functions with Mapping Diagrams: Linear Fractional Transformations." MAA Contributed Paper Session on Revitalizing Complex Analysis, Jan.9, 2016.
 What Place Does Philosophy Have in Teaching Mathematics? Preliminary report (pdf). POMSIGMAA Contributed Paper Session on Using Philosophy to Teach Mathematics, Jan. 7, 2016.
 "Making Sense of Calculus with Mapping Diagrams", JMM, MAA Minicourse #7 Jan 7 and 9, 2016, (LINKS)
 "Making Sense of Solving Linear and Quadratic Equations with Mapping Diagrams",CMC^{3} Conference, Monterey, CA, December 12, 2015 (Links)
 "Equations, Functions, and Mapping Diagrams in Common Core" , CMC North Conference, Pacific Grove, CA, December 12, 2015 (Links)
 To Be Entered: MD Presentations at ICTCM
LasVegas, Sping, 2015; Nevada Math Project Conference (Reno), UN.Las
Vegas; New Mexico State University;.
University of Northern Arizona Colloquium and Math Club; and Maui CC Math Club Summer/Fall, 2015,
 "Mapping Diagrams Take on Calculus and Complex Variables" HSU Mathematics Department Colloquium, Feb. 5, 2015
 "Using Mapping Diagrams to Understand Linear Functions",UC Davis Math Project Saturday Series 201415,November 1, 2014 (Links)
 "Do You Want Your Students To Write Proofs? Suggestions to
Improve Writing Proofs." Project NExT Panel at MathFest, August 6, 2014. (Link to presentation)
 Introduction to Sensible Calculus: A Thematic Approach, The Anja S. Greer Conference on Mathematics, Science and Technology
June 22  June 27, 2014 (Links to presentations and materials)
 "Functions, Duality, and Mapping Diagrams", UC Davis Math Club Presentation, May 22, 2014.
 AMATYC
Webinar, "Using Mapping Diagrams to Understand
Trigonometric Functions" April 10, 2014.

"The Role of Philosophy in Proof:Euclid's Proof of Proposition One.", Folsom Lake Math Club March 19, 2014 YouTube (30 minutes)

"A Sensible Approach to Calculus: Differential Equations, Estimation, and Modelling in The Fundamental Theorem.",Sacramento Valley Community College Mathematics Conference, March 15, 2014 (pdf) YouTube Part I YouTube Part II

"The
Role of Philosophy in Proofs",HSU
Colloquium, Feb 27, 2014 . YouTube (30
minutes)

"Making
Sense of Series and Sequences in The First Calculus Course."JMM,
Baltimore, MD. January 18, 2014 (pdf)

"Functions,
Duality, and Mapping Diagrams" Folsom Lake College Math
Club Presentation, Dec. 11, 2013, Folsom, CA.

"Visualizing
Linearity:Alternatives to Lines and Planes"
Sacramento City College, Dec. 10, 2013.

"Functions,
Duality, and Mapping Diagrams" Howard University
Presentation, December 2, 2013, Washington, DC.

"Concepts
to Drive Technology in the 21st Century" (html),
ComputerBasedMath
™(YouTube Video) (CBM) Education
Summit, UNICEF, NYC, Nov.22 ,2013.
 AMATYC
Webinar, "Using Mapping Diagrams to Understand
Functions" (Watch
on youtube) October 15, 2013.

"Functions,
Duality, and Mapping Diagrams" FortySecond Annual State
of Jefferson Mathematics Congress October 5, 2013, Orick, CA

"Logic is Not
Epistemology:Should Philosophy Play a Larger Role in Learning
about Proofs?" MathFest, Hartford, CT, August 2, 2013

"A
Simple Proof of the Classification of Conics by the
Discriminant ," MathFest, Hartford, CT,
August 2, 2013

"Projection:
Examples to Illuminate Unification, Generalization, and
Abstraction." HSU Colloquium, March 28, 2013

"Designing
an Introduction to Proofs Course Understanding the Problem:
Unification, Generalization or Abstraction?" JMM. San
Diego, January 10, 2013 (pdf)

"The
Benefits of A Habit: Examining Evidence to Understand
Statements and Proofs." JMM. San Diego,
January 12, 2013 (pdf)

"Learning
from Newton" (pdf)
HPM, Berkeley, CA 10282012

Utah
Workshop Materials:(1) Mapping Diagrams and (2) Sensible
Calculus, July, 2012

"Square
Roots: Adding Philosophical Contexts and Issues to Enhance
Understanding." JMM, New Orleans, January 8, 2011 (pdf)
 "Two
Different Approaches to Getting Students Involved in Writing
Proofs ." JMM, New Orleans, January 07, 2011 (pdf)