About Us
Catherine Twomey
Fosnot
Catherine Twomey Fosnot is Professor of Education at the City College
of New York and Director of Mathematics in the City, a national center
for professional development located at the college. She has authored
or co-authored many books and articles on mathematics education, most
recently the Young Mathematicians at Work series and the accompanying
professional development materials funded by NSF. The AERA SIG on Constructivism
has twice awarded her their “significant contribution” award.
Antonia Cameron
Antonia Cameron is the Co-director of Mathematics in the City. She is a frequent workshop leader using the digital materials and co-authored and field-tested many of the accompanying facilitator guides.
Toni coauthored the units, Muffles' Truffles: Multiplication and
Division with the Array (Grades 3-5) and Games Throughout the
Year (Grades K-3).
Madeline Chang
Madeline Chang has been a teacher in kindergarten, first, second
and third grades in Region 9 in New York City for the past eighteen
years. She has also worked as a math consultant for inservice programs
in other school districts and began working with Mathematics in the
City in 1995. Her work is also discussed in Young Mathematicians
at Work: Constructing Number Sense, Addition and Subtraction
written by Cathy Fosnot and Maarten Dolk. She studied as an undergraduate
at the University of Michigan and the City University of New York
and holds a masters degree from the Bank Street College of Education.
Madeline co-authored Beads and Shoes,Making Twos: Extending Number
Sense (Grades K–3).
Maarten Dolk
Maarten Dolk is a researcher and developer of mathematics education
at the Freudenthal Institute in the Netherlands, where he has been
involved in the development of inservice materials for teachers and
of multimedia learning environments for student teachers. He has also
directed an inservice project in the Netherlands for teacher educators
and staff developers. His work in the United States is related to
the inservice of primary school teachers.
Maarten coauthored The Double Decker Bus: Early Addition and Subtraction
(Grades K–3) and Organizing and Collecting: The Number System
(Grades K–3).
Bill Jacob
Bill Jacob is a professor of mathematics at the University of California,
Santa Barbara. In addition to his mathematical research, he develops
and teaches courses for undergraduates preparing for teaching careers.
Over the past fifteen years he has designed and led numerous professional
development programs for K-12 teachers. He has been a collaborator
with Mathematics in the City for six years.
Bill coauthored The California Frog-Jumping Contest: Algebra (Grades
4–6), Best Buys, Ratios, and Rates: Addition and Subtraction of Fractions
(Grades 4–6) and The Mystery of the Meters: Decimals (Grades
4–6).
Frans van Galen
Frans van Galen is a researcher and developer of mathematics education
at the Freudenthal Institute in the Netherlands. He is co-author of
Mathematics in Context, a math program for middle school, and of Dutch
math programs for the primary levels. He is involved in several projects
on inservice education. He is also a developer of mathematical games
and puzzles for the internet.
Frans co-authored Groceries, Stamps, and Measuring Strips: Early
Multiplication (Grades 3–5).
Kara
Louise Imm
Kara Louise Imm is a former middle and high school mathematics teacher in the New York City Public
Schools. Currently she is pursuing a doctorate in Urban Education at the Graduate Center (City University
of New York - CUNY), teaching at the School of Education at Pace University as a lecturer, and leading
inservice workshops for fellow teachers at Mathematics in the City. She is a graduate of Stanford University
and Bank Street College of Education, where she earned a Master's in Education, Early Adolescence.
Kara co-authored Minilessons for Operations with Fractions, Decimals,
and Percents (Grades 4–6).
Miki Jensen
Miki Jensen is currently the Director of Inservice at Mathematics in the City. She taught fourth and fifth
grade at PS 234 in Manhattan before going on to do staff development work and take on the full time job of
being a mother.
Miki co-authored The Box Factory: Extending Multiplication with
the Array (Grades 3–5).
Patricia Lent
Patricia Lent has been teaching second and third grade at P.S. 234
in Region 9 of New York City for the past nine years. For the last
three years she has been a member of a think tank on algebra at Mathematics
in the City. Many of the activities in this unit were field tested
in her classroom. She has previously written about the subway investigation
described in Trades, Jumps and Stops: Early Algebra, with Ed Wall
and Cathy Fosnot, for Connect magazine (“Young Mathematicians
at Work: Constructing Algebra in Grade Two”). She has also written
a chapter for Forever After: New York City Teachers on 9/11
(edited by Teachers College Press). She is a graduate of the University
of Virginia and Bank Street College of Education. Prior to becoming
a teacher, she performed with the Merce Cunningham Dance Company and
the White Oak Dance Project.
Trish co-authored Trades, Jumps, and Stops: Early Algebra (Grades
K–3).
Nina Liu
Nina Liu has worked as a mathematics coach in New York City public schools for the last eight years.
Before becoming a staff developer, she taught for nine years in early childhood classrooms, at P.S. 234 in
Region 9 and at Pound House Children’s Center in Ann Arbor, Michigan. She has been involved with the
Mathematics in the City project since 1996. She is a graduate of the University of Pennsylvania and Bank
Street College of Education. Prior to becoming a teacher, she worked in magazine publishing. She lives in
Brooklyn, New York, with her husband and two children.
Nina co-authored The Double Decker Bus: Early Addition and Subtraction
(Grades K–3) and Organizing and Collecting: The Number System
(Grades K–3). Nina also co-authored the read aloud book The
Double Decker Bus.
Chris Natale
As a classroom elementary teacher for many years, Chris Natale enjoys
helping children make sense of mathematics. He is currently a Math
Specialist for Port Washington, NY Public Schools. He also serves
as an adjunct staff member for Bank Street College in New York City.
Chris holds a Masters Degree in Elementary Education from Hofstra
University and a Masters in Leadership in Math Education from Bank
Street College. He has been involved with Mathematics in the City
for over three years. He lives in New York City with his wife and
two daughters.
Chris co-authored The Teachers’ Lounge: Place Value and Division
(Grades 3–5).
John Michael
Siegfried
John Michael Siegfried (more commonly known as Zig among his friends)
holds a BA degree in mathematics and chemistry from Juniata College
in Huntingdon, PA and an MA degree in Mathematics from the University
of California, Santa Barbara. For several years he worked for the
Santa Barbara public schools helping children learn mathematics and
co-taught pre- and inservice summer institutes at UCSB with Bill Jacob.
He currently resides in San Diego where he is a Ph.D. candidate in
the Mathematics and Science Education Program (MSED) administered
jointly by the University of California, San Diego and San Diego State
University.
John co-authored The Mystery of the Meters: Decimals (Grades
4–6).
Lynn D. Tarlow-Hellman
Lynn D. Tarlow-Hellman is a professor of mathematics education at
The City College of New York. She has extensive experience in teaching
mathematics to students at all educational levels and in creating
professional development programs for teachers and teacher educators.
Dr. Tarlow is currently directing the Mathematics in the City professional
development middle school initiative—Building Collaborative Communities
of Practice. Her research interests lie in the study of students’
development of meaningful mathematical ideas and the teacher’s role
in empowering them. She has authored or co-authored several books,
articles, and papers on mathematics education and has delivered many
invited national and international presentations about her research
and work.
Lynn co-authored Exploring Parks and Playgrounds:Multiplication
and Division of Fractions (Grades 4–6).
Willem Uittenbogaard
Willem Uittenbogaard is Professor of Mathematics Education at the
Hogeschool Alkmaar—a preservice institute in the Netherlands—and a
researcher at the Freudenthal Institute. With more than 35 years of
experience in pre- and inservice development in the Netherlands and
abroad, he is a frequent workshop leader with Cathy Fosnot. He was
one of the co-founders of the Mathematics in the City program and
spent two years in residence in New York City teaching at the center
and working in New York City schools. He is now working as a researcher
in a project called TalentPower, in which young children (3-5 years
of age) can improve their skills in the fields of mathematics and
science.
Willem co-authored Minilessons for Operations with Fractions,
Decimals, and Percents (Grades 4–6), Resource Guide: Minilessons
for Early Addition and Subtraction (Grades K–3), Resource
Guide: Minilessons for Extending Addition and Subtraction (Grades
K–3), Resource Guide: Minilessons for Early Multiplication and Division
(Grades 3–5), and Resource Guide: Minilessons for Extending
Multiplication and Division (Grades 3–5).
