There are 3 books in the Don Tillman series. The newest book is The Rosie Result which came out in 2019.

1
The Rosie Project

Book cover of The Rosie Project
The international bestselling romantic comedy “bursting with warmth, emotional depth, and…humor,” (Entertainment Weekly) featuring the oddly charming, socially challenged genetics professor, Don, as he seeks true love.

The art of love is never a science: Meet Don Tillman, a brilliant yet socially inept professor of genetics, who’s decided it’s time…

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2
The Rosie Effect

Book cover of The Rosie Effect

Sink into the joyously weird and wonderful next chapter of Don and Rosie, in Graeme Simsion's unmissable sequel to the bestselling The Rosie Project!

'Touching and entertaining' Mail on Sunday
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Forty-one-year-old geneticist Don Tillman had never had a second date before he met Rosie.

Now, living in New York…

3
The Rosie Result

Book cover of The Rosie Result

Curl up with the big-hearted and hilarious final instalment in the Rosie Project series about overcoming life's obstacles with a little love and a lot of overthinking

THE INTERNATIONAL MILLION COPY BESTSELLER

'Incredibly funny, life-affirming and warm-hearted' HEAT
'A fast-paced enjoyable journey. Genuinely heartwarming' INDEPENDENT
'Hilarity is the order of…