- Saint Louis University, St Louis MO, USA Associate Professor, June 2018-current.
- Duke University, Durham NC, USA Visiting Associate Professor, August 2018-May 2019.
- University of Texas, Austin TX, USA R. H. Bing Instructor, August 2010-August 2012.
- Texas A&M University, College Station TX, USA Visiting Assistant Professor, September 2009-August 2010.

Assistant Professor, August 2012-June 2018.

- Texas A&M University, College Station TX, USA Ph.D., Mathematics, August 2009
- Guilford College, Greensboro NC, USA B.S., Mathematics and Physics, May 2003

Thesis title: Upper estimates for Banach spaces.

Advisor: Thomas Schlumprecht

Thesis title: Ellipsoidal and convex tight frames.

Advisors: Ruddy Gordh and Elwood Parker

- National Science Foundation Research Grant, PI, "Frame theory and phase retrieval", DMS-2154931, $332,696, June 2022-May 2025.
- Simons Foundation Collaboration Grant for Mathematicians, PI, "Frames and bases in theory and application", 706481, $42,000, Sep 2020-May 2022.(concluded early due to receiving NSF grant)
- Simons Foundation Collaboration Grant for Mathematicians, PI, "Coordinate systems of Banach spaces", 353293, $35,000, Sep 2015-Aug 2020.
- National Science Foundation Research Grant, PI, "Topics in the geometry of Banach spaces", DMS-1001929, $76,443, June 2010-May 2014.
- Faculty Travel Grant, $1,200 per year, University of Texas at Austin, 2011-2013.
- R.H. Bing fellowship, $7,000 per year and $1,000 travel allowance per year, University of Texas at Austin, 2010-2013
- Mathematical Association of America Project NExT fellow, 2010-2011.
- L.F. Guseman Prize in Mathematics Award, Texas A&M University, 2009. Given for outstanding research, teaching, and service as a graduate student.
- AUF Fellowship, Texas A&M University, Sep 2004-Aug 2005 and Sep 2006-Aug 2009.
- NSF-VIGRE Fellowship, Texas A&M University, Sep 2003-Aug 2004 and Sep 2005-Aug 2006.
- The Learning Commons Outstanding Tutor Award, Guilford College, 2003. Given to the tutor who has contributed in the most positive, responsible, and creative ways.

- Postdoc advisor for Dorsa Ghoreishi, St Louis University, Fall 2020-present
- Phd advisor for Wedad Alharbi, St Louis University, Spring 2021-present
- Phd advisor for Salah Alshabhi, St Louis University, Fall 2020-present
- Masters thesis advisor for Joseph Eisner, St Louis University, Fall 2016-Spring 2017. Thesis title:
*Continuous Schauder frames and reflexivity in Banach spaces.*Entered Phd program at University of Virginia after graduating. - Undergraduate thesis advisor for Eileen Martin, University of Texas, Fall 2010-Spring 2012. Thesis title:
*Global coordinate systems: Continuously moving finite-dimensional unit norm tight frames on smooth manifolds.*Received Goldwater fellowship for her research. Entered Phd program at Stanford University after graduating.

- Editor for Journal of Fourier Analysis and Applications, Summer 2022-present
- Faculty advisor for the Math and Computer Science club, St Louis University, Fall 2014-present

- W. Alharbi, D. Freeman, D. Ghoreishi, C. Lois, and S. Sebastian Stable phase retrieval and perturbations of frames, submitted, 13 pages.
- P. Balazs, D. Freeman, R. Popescu, and M. Speckbacher, Quantitative bounds for unconditional pairs of frames, submitted, 19 pages.
- D. Freeman, T. Oikhberg, B. Pineau, and M.A. Taylor, Stable phase retrieval in function spaces, submitted, 57 pages.
- W. Alharbi, S. Alshabhi, D. Freeman, and D. Ghoreishi, Locality and stability for phase retrieval, submitted, 14 pages.
- K. Beanland and D. Freeman, Shrinking Schauder frames and their associated spaces, submitted, 18 pages.
- R. Calderbank, I. Daubechies, D. Freeman, and N. Freeman, Stable phase retrieval for infinite dimensional subspaces of L2(ℝ), submitted, 27 pages.
- D. Freeman and D. Ghoreishi, Discretizing Lp norms and frame theory, J. Math. Anal. and Applications, (2022) 17 pages. doi.org/10.1016/j.jmaa.2022.126846
- D. Freeman, Th. Schlumprecht, and A. Zsák, Banach spaces for which the space of operators has 2
^{𝔠}closed ideals, Forum of Mathematics, Sigma,**9**, E27, (2021) 20 pages. doi:10.1017/fms.2021.23 - D. Freeman, Th. Schlumprecht, and A. Zsák, Addendum Closed ideals of operators between the classical sequence spaces. Bull. Lond. Math. Soc, 53, no. 2, (2021), 593-–595.
- D. Freeman, A.M. Powell, and M. Taylor, A Schauder basis for L
_{2}consisting of non-negative functions, Mathematische Annalen, (2021) 28 pages, https://doi.org/10.1007/s00208-021-02143-4 - J. Eisner and D. Freeman, Continuous Schauder frames for Banach spaces, J. Fourier Anal. and Apps.,
**26**, no. 4, (2020), 30 pages, https://doi.org/10.1007/s00041-020-09776-0 - J.A. Chavez-Dominguez, D. Freeman, and K. Kornelson Frame potential for finite-dimensional Banach spaces. , Linear Algebra and Applications,
**578**(2019), 1--26. - D. Freeman and D. Speegle, The discretization problem for continuous frames, Advances in Math.,
**345**(2019), 784--813. - D. Freeman, E. Odell, B. Sari, and B. Zheng, On spreading sequences and asymptotic structures, (with , Trans. AMS,
**370**, no. 10, (2018) 6933--6953. - D. Freeman, Th. Schlumprecht, and A. Zsak, Closed ideals of operators between the classical sequence spaces, Bulletin of the London Math. Soc.,
**49**, no. 5 (2017), 859--876. - K. Beanland, D. Freeman, R. Causey, and B. Wallis Classes of operators determined by ordinal indices, J. Functional Analysis,
**271**, no. 1, (2016) 1691--1746. - P. G. Casazza, D. Freeman, and R. Lynch, Weaving Schauder frames, J. Approximation Theory,
**211**(2016) 42--60. - F. Baudier, D. Freeman, Th. Schlumprecht, and A. Zsak, The metric geometry of the Hamming Cube and applications, Geometry and Topology,
**20**(2016), 1427--1444. - K. Beanland, D. Freeman, and P. Motakis The stabilized set of p's in Krivine's Theorem can be disconnected,
Advances in Math.,
**281**(2015), 553--577. - K. Beanland, D. Freeman, and R. Liu, Upper and lower estimates for Schauder frames and atomic decompositions,
Fund. Math.
**231**(2015), 161--188. - D. Freeman, R.
Hotovy, and E. Martin, Moving finite unit norm tight frames for S
^{n}, Illinois J. Math.,**58**(2014), no. 2, 311--322 - D. Freeman, E. Odell, Th. Schlumprecht, and A. Zsak, Unconditional structures of translates for
L
_{p}(R^{d}). Israel J. Math.,**203**(2014), no. 1, 189--209. - P.N. Dowling, D. Freeman, C.J. Lennard, E. Odell, B. Randrianantoanina, and B. Turett A weak Grothendiek compactness principle for Banach spaces with a symmetric basis.
Positivity,
**18**(2014), no. 1, 147--159. - K. Beanland and D. Freeman, Uniformly factoring weakly compact operators. J. Functional Anal,
**266**, (2014), no. 5, 2921--2943. - D. Freeman, E. Odell, B. Sari, and Th. Schlumprecht, Equilateral sets in uniformly smooth Banach spaces.
Mathematika,
**60**(2014), no. 01, 219--231. - D. Freeman, D. Poore, A. R. Wei, and M. Wyse, Moving Parseval frames for vector bundles. Houston J. of Math.,
**40**, (2014), no. 3, 817--832. - P.N. Dowling, D. Freeman, C.J. Lennard, E. Odell, B. Randrianantoanina, and B. Turett, A weak Grothendiek compactness principle.
J. Functional Analysis
**263**(2012), no. 5, 1378--1381. - S.A. Argyros, D. Freeman, R.
Haydon, E. Odell, Th. Raikoftsalis, Th. Schlumprecht, and D.Z. Zisimopoulou, Embedding Banach spaces into spaces with very few operators. J. Functional Anal.
**262**(2012), no. 3, 825--849. - K. Beanland and D. Freeman, Ordinal ranks on weakly compact and Rosenthal operators. Extracta Mathematicae,
**26**(2) (2011), 173--194. - S. Dilworth, D. Freeman, E. Odell, and Th. Schlumprecht, Greedy bases for Besov spaces. Constructive Approx.,
**34**(2011), no. 2, 281--296. - D. Freeman E. Odell, and Th. Schlumprecht, The universality of l_1 as a dual space. Math. Annalen.
**351**(2011), no. 1, 149--186. - D. Freeman, E. Odell, Th. Schlumprecht, and A. Zsak. Banach spaces of bounded Szlenk index II , Fund. Math.
**205**(2009) 161--177. - D. Freeman, Weakly null sequences with upper estimates.
Studia Math.
**184**(2008), no. 1, 79--102. - K. Dykema, D. Freeman, K. Kornelson, D. Larson, M.
Ordower, and E. Weber, Ellipsoidal tight frames and projection decompositions of
operators. Illinois J. Math.
**48**(2004), no. 2, 477--489.

- Colloquium, University of Central Florida,
*Title: Stable phase retrieval*, November 2022. - Plenary talk, Strobl22: Applied Harmonic Analysis and Friends, Strobl Austria,
*Title: Stable phase retrieval for finite and infinite dimensional subspaces*, June 2022. - Computational Analysis Seminar, Vanderbilt University,
*Title: Stable phase retrieval for infinite dimensional subspaces*, February 2022. - International Workshop on Operator Theory and its Applications, Special Session on operator ideals and operators on Banach spaces, Lancaster UK,
*Title: Banach spaces for which the space of operators has 2*, August 2021.^{𝔠}closed ideals - Thematic Programme in Applied Functional Analysis and High-Dimensional Approximation, Erwin Schrodinger Institute, Vienna Austria, April-May 2021. (Cancelled due to COVID-19.)
- Codes and Expansions Seminar, Zoom,
*Title: Discretizing L*, March 2021._{p}norms - Plenary talk, Strobl20: Applied Harmonic Analysis and Friends, Strobl Austria, June 2020. (Cancelled due to COVID-19.)
- Banach spaces webinar, Zoom,
*Title: A Schauder basis for L*, May 2020._{2}consisting of non-negative functions - Analysis seminar, Georgia Tech,
*Title: Stable phase retrieval for subspaces of L*, March 2020._{2}(R) - Colloquium, Saint Louis University,
*Title: Stable phase retrieval for infinite dimensional subspaces of L*, February 2020._{2}(R) - Joint Mathematics Meeting, Special Session on Frames, Designs, and Optimal Spherical Configurations, Denver CO,
*Title: Stable phase retrieval from magnitude of point evaluation for infinite dimensional subspaces of L*, January 2020._{2}(R) - Colloquium, Acoustic Research Institute, Vienna Austria,
*Title: The discritization problem for continuous frames,*June 2019. - Measure theory seminar, Kent State University,
*Title: Possible and impossible positive coordinate systems for L_p(R),*April 2019. - Colloquium, Kent State University,
*Title: The discritization problem for continuous frames,*April 2019. - Spring western sectional meeting of the AMS, Special Session on Banach Space Theory and Metric Embeddings, University of Connecticut Hartford,
*Title: Finite unit norm tight frames and the frame potential in Banach spaces,*April 2019. - Joint Mathematics Meeting, Special session on
AMS Special Session on Mappings on Metric and Banach Spaces with Applications to Fixed Point Theory, Baltimore MD,
*Title: Continuous Schauder frames for Banach spaces*, January 2019. - Kosorok lab seminar, Department of Bio-statistics, University of North Carolina,
*Title: A friendly introduction to Hilbert spaces*,January 2019. - Recent Advances in Functional Analysis, Kent State University,
*Title: Finite unit norm tight frames and the frame potential in Banach spaces*, October 2018. - 7th International Conference on Computational Harmonic
Analysis, Vanderbilt University,
*Title: The discretization problem for continuous frames*, May 2018. - International Conference on Mathematics and Statistics, University of Memphis
*Title: Continuous Schauder frames for Banach spaces*, May 2018. - Spring western sectional meeting of the AMS, Special session on wavelets, frames, and related expansions, Portland State University,
*Title: Finite unit norm tight frames and the frame potential in Banach spaces*, April 2018. - Fall central sectional meeting of the AMS}, Special session on Banach Space and Applications, University of North Texas,
*Title: The discretization problem for continuous frames and coherent states*, September 2017. - Spring Eastern sectional meeting of the AMS, Special session on Banach Space Theory and Metric Embeddings, Hunter College,
*Title: The discretization problem for continuous frames*, May 2017. - INFAS, Creighton University,
*Title: The discretization problem for continuous frames*, April 2017. - Spring Southeastern sectional meeting of the AMS, Special session on Frame theory, College Of Charleston,
*Title: The discretization problem for continuous frames and coherent states*, March 2017. - Joint Mathematics Meeting, Special session on
Bases in Function Spaces: Sampling, Interpolation, Expansions and Approximations, Atlanta GA,
*Title: The discretization problem for continuous frames and coherent states*, January 2017. - Workshop in Analysis and Probability,Texas A&M University,
*Title: The Discretization Problem for continuous frames*, July 2016. - International Wokshop on Operator Theory and Applications, Washington University in St Louis,
*Title: The Discretization Problem for continuous frames*, July 2016. - Karcher Colloquium, University of Oklahoma,
*Title: Coordinate systems formed by translations of a single function in L*, April 2016._{p}(R) - Frames seminar, University of Oklahoma,
*Title: Discrete and Continuous frames*, April 2016. - Guilford physics reunion, Guilford College,
*Title: The discretization problem in math and physics*, April 2016. - Fall Central sectional meeting of the AMS, Special session on Banach Spaces and Applications, University of Memphis
*Title: Weaving bases and frames for Banach spaces*, October 2015. - Workshop in Analysis and Probability,Texas A&M University,
*Title: Weaving bases and frames for Banach spaces*, July 2015. - Spring Central sectional meeting of AMS}, Special session on
Frames, Wavelets, and their Applications, Michigan State,
*Title: An unconditional FDD of translations of a single function for L*, March 2015._{p}for p>2 - Undergraduate Analysis Seminar, Washington and Lee
University,
*Title: The Hairy Ball Theorem*, October 2014. - Analysis Seminar, National Technical University of Athens,
*Title: Coordinate systems of translations of a single function in L_p(R)*, June 2014. - 7th Conference on Function Spaces, Southern Illinois
University Edwardsville,
*Title: Unconditional coordinate systems formed by translations of a single function in L_p(R)*, May 2014. - 5th International Conference on Computational Harmonic
Analysis, Vanderbilt University,
*Title: Coordinate systems of translates of a single function in L_p(R)*, May 2014. - Colloquium,
University of Miami Ohio,
*Title: Redundant frames on Manifolds*, November 2013. - Fall Central sectional meeting of AMS, Special session on
Wavelets, Frames, and Related Expansions, Washington University in St Louis,
*Title: Dilations of Schauder frames for Banach spaces*, October 2013. - Workshop in
Analysis and Probability, The Mathematical Legacy of Ted Odell,
Texas A&M University,
*Title: Greedy bases for Besov spaces*, August 2013. - Banach Spaces: Geometry and Analysis, Memorial Conference
for Joram Lindenstrauss, Hebrew University,
*Title: Equilateral sets in uniformly smooth Banach spaces*, May 2013. - Spring Southeastern sectional meeting of AMS, University of
Mississippi,
*Title: Equilateral sets in uniformly smooth Banach spaces*, invited talk, Special session on Banach Spaces and Operators on Them, March 2013. - Larsonfest: Operator Algebras, Frames, and Undergraduate
Research, Texas A&M University,
*Title: Frames of integer translates for L_p(R) with p>2*, July 2012. - ICOMAS conference, session on Banach Space Theory and
Applications in memory of Nigel Kalton, University of Memphis,
*Title: A frame of integer translates of a single function for L_p(R) with p > 2*, May 2012. - Workshop on Banach space theory, Banff International
Research Station,
*Title: Embedding into BD spaces and spaces with very few operators*, March 2012. - Millican-Colloquium, University of North Texas,
*Title: Embedding Banach spaces and factoring operators*, October 2011. - Workshop in Analysis and Probability, Texas A&M
University,
*Title: Shrinking and boundedly complete Schauder frames for Banach spaces*, July 2011. - Summer meeting of the CMS, session on "Banach Spaces and
Operators Between Them", University of Alberta,
*Schauder frames for Banach spaces*, June 2011. - Joint Linear Analysis/Banach space Seminar, Texas A&M
University,
*Title: Weak Grothendieck compactness principles*, May 2011. - Southeastern section meeting of the AMS, Special Session on
Geometry of Banach Spaces, University of Richmond,
*Title: Redundant frames for vector bundles*, November 2010. - Analysis Seminar, Virginia Commonwealth University,
*Title: Redundant frames on manifolds*, September 2010. - VOTCAM, Virginia Commonwealth University,
*Title: Greedy bases for Besov spaces*, September 2010. - Linear Analysis Seminar, Texas A&M University,
*Title: Embedding into L_infty Banach spaces*, April 2010. - Workshop on Optimal Frames and Operator Algebras, San
Francisco State University,
*Title: Embedding Banach spaces*, January 2010. - SUMIRFAS, Texas A&M University,
*Title: The universality of l_1 as a dual space*, August 2009. - Workshop on analysis and probability, Texas A&M University,
*Title: A greedy basis for (sum l_p^n)_q*, July 2009. - Analysis seminar, University of Texas,
*Title: The universality of l_1 as a dual space*, October 2008. - IMST conference, session on Banach Space Theory and
Applications, University of Memphis
*Title: Weakly null sequences with upper estimates*, May 2008.