I aspire to inspire, and I believe that mathematics is for all. I enjoy writing, designing, composing music and studying how mathematics relates to everyday life.

How did I start out?

In Form 2 (Grade 8 in the US), I visited Murray Bourne’s website Interactive Mathematics as well as his blog, and from the latter I found Miss Celine Loi, a private maths tutor in Singapore. Challenged to find real-life uses of quadratic equations thanks to #1 of Murray’s post, I found Plus Magazine, which changed my life in many ways:

  • It featured the Maths in The City competition (now gone), which I entered and was encouraged to keep writing;
  • From the Maths in The City Twitter feed, I found out about the Ada Lovelace Day mentorship; and
  • It shaped how I wrote the content for the new website of the Department of Mathematics at CUHK http://www.math.cuhk.edu.hk.

My hobbies are very varied. Apart from indoor activities like reading and knitting, I also like travelling and various sports: running, swimming, tennis and archery. In my spare time, I keep learning new things. In fact, I want to write, draw, sing and speak about mathematics and its applications to a wide audience in the next five years from 2016 to 2020.

I hope my story inspires girls to thrive in mathematics and the sciences just by being who they are: girls.


  • Web content writing (web copywriting): includes social media optimization
  • Writing for press: newspaper, newsletter writing
  • Reviews: mainly books; movies are welcome as well
  • Poetry and song lyrics

Contact me now for a quote.

Current engagements:

  • Writing fiction and nonfiction
  • Copywriting in maths


Disclaimer: This is not an exhaustive list. I am still pursuing opportunities to write.

2017 (upcoming) Novelette “Don’t Offend A Girl In Love”, in horror anthology Whispers in the Dark by the Just-Us League

2017 Interview by J. E. Kilmov

2017 Keynote speaker at International Women’s Day event “I Am A Woman”, CUHK: “How Girls Can Shape The Future Through STEM (Science, Technology, Engineering and Mathematics)”

2017 Copywriting for Julia Robinson Mathematics Festival

2017 Joined the Just-Us League, a famous international online writing group

2016 My sharing on a teaching session is out!

2016 Interviewed for “wSTEM connections”

2016 TEDxCUHK 2016 (1) (2)

2016 Huffington Post blogger (March – September)

2016 “A Kaleidoscope Into Tessellations”, Issue 7 of IMOment (official school-wide publication of the 57th International Mathematical Olympiad 2016 in Hong Kong)

2016 P.14, sharing on Spotlight Asia Youth Leaders’ Experience & Action Programme 2015 “SAYLEAP”, a leadership training camp between Singaporean delegates and CUHK students, on CUHK University Marketplace Issue 178 (January 2016)(PDF here)


Cassandra's sharing on the leadership training day camp (click for original)

“SAYLEAP” sharing

2015-2016 CUHK Newsletter Issue #13 “CUHK’s Maths Girls”

  • Came up with the theme in response to Ada Lovelace Day 2015
  • Interviewed all subjects featured in the newsletter
  • Edited and proofread the newsletter
  • Newsletter published 19 January 2016

2015 More Passion for Science: Journeys Into the Unknown, edited by Suw Charman-Anderson

2015 “From Mother’s Three-Word Advice To Aspiring Mathematician #MySTEMrolemodel”, Digital Science

2015 Department of Mathematics, CUHK website

2014-15 Department of Mathematics, CUHK: Newsletter Issue 12

  • Brief Notes in Math: Emmy Noether (p.6)

2013 Cassandra × Cambridge on the Pembroke-King’s Programme

2012- regularly added social media content for Twitter account @leeyieng with good click-through rates

2012-13 SCMP Young Post: Junior Reporter of the Year – Nominated

  • Reviewed new books
  • Reported events in Hong Kong related to youths
  • Featured on weekly Top Ten column

2011 Maths in the City: Hong Kong Space Museum (East Wing) – Highly Recommended (My only surviving copy of the article at Maths in the City. The video, which could not be watched in the PDF, is embedded below.)

Formal bio (as of 24 August 2017):

Cassandra Lee Yieng is a published author, artist, musician and mathematician. She majored in mathematics and minored in information engineering at the Chinese University of Hong Kong (CUHK) as a bachelor’s student, and took up computer science as a master’s student. She is now a mathematics teacher.

She caught press attention and broke through obscurity in 2011 thanks to her “highly recommended” entry on the Hong Kong Space Museum (East Wing) at the “Maths in the City” competition hosted by Professor Marcus du Sautoy of the University of Oxford.

She was nominated for SCMP Young Post Junior Reporter of the Year in 2012. In spring and summer 2015, she supplied the text content of CUHK’s Department of Mathematics’s new website at www.math.cuhk.edu.hk. She spearheaded the 13th issue featuring women mathematics graduates from CUHK.

The article which made her a published author was on Emmy Noether, and it was published on Ada Lovelace Day 2015 in the book More Passion For Science: Journeys Into The Unknown, edited by Suw Charman-Anderson, founder of Ada Lovelace Day. An earlier and abridged version of that article appeared in the 12th issue of the aforementioned departmental Newsletter. She spearheaded the production of the 13th issue of the said newsletter, the topic of which was “CUHK’s Maths Girls”.

She also has published an article on tessellations for the 7th issue of IMOment, the newsletter for the International Mathematical Olympiad in Hong Kong in 2016. She blogged at Huffington Post and studied at Adobe Education Exchange. She spoke at TEDxCUHK 2016, the theme of which is “Light in the Dark”, on her mathematical journey, and earlier in 2015 at the Y.W.C.A. Hioe Tjo Yoeng College’s career talk on mathematics and writing.

In 2017, she did copywriting for the Julia Robinson Mathematics Festival, an initiative to bring students aged 10-14 into the joy of learning mathematics. She spoke on International Women’s Day at CUHK on how girls can shape the future through STEM (Science, Technology, Engineering and Mathematics). Her graduate #fintech thesis was on sentiment analysis of Chinese financial texts. She also joined the writer’s community known as the Just-Us League.

Never seeing herself as a nerd, she aspires to inspire girls to thrive in mathematics and the sciences, showing them that they can make a difference in the world in spite of their gender.

Her hobbies are very varied. She loves reading tangible books and electronic ones, as well as knitting, but she also loves to travel and play various sports from tennis to archery. In her spare time she keeps learning new things.