'whose sessions' is correct and used in written English.
It is used for possessive purposes and is usually followed by a noun, such as "clients" or "patients". For example, you can say: "The therapist was popular amongst whose sessions she conducted."
WAYWARD PRESS about the annual meeting of the American Newspaper Publishers Association, all of whose sessions were held at the Waldorf-Astoria.
The health plan pays for four visits to the doctor and four visits to the dietitian, whose sessions are aimed at improving the diet of the entire family.
After the publication, Mr. Makhul pushed for an open airing of the issue in Parliament, whose sessions are broadcast on cable television.
By E. J. Kahn The New Yorker, May 25 , 1957P. 94 WAYWARD PRESS about the annual meeting of the American Newspaper Publishers Association, all of whose sessions were held at the Waldorf-Astoria.
In attending the conference, whose sessions have been held at the Waldorf-Astoria Hotel since Wednesday, many of the hundreds of religious leaders who attended said they felt drawn by the event's association with the United Nations and by its theme of peace.
All interventions involved 9 weekly 1-h sessions, except for the ContM-only condition whose sessions lasted about 15 min.
Lenny, whose session had cost $32, said I didn't need any more lessons; I was ready for my road test.
Before it, most reggae songs were initiated by a singer bringing lyrics and a melody to a producer, whose session players would work out a musical arrangement to fit the structure of the song.
For Lib Dem peer and former high representative for Bosnia Paddy Ashdown, meanwhile, whose session I've just come from, the instructive lessons were in the similarities - or, more to the point, the differences - between the Bosnian and Iraqi adventures (as expounded in his book Swords And Ploughshares: Building Peace in the 21st Century: Bringing Peace to the 21st Century).
She watched the $15,000 — and our last chance for a sale — disappear next to the sunken chest of 81-year-old Amarillo Slim Preston, a professional gambler whose session in the 40th annual World Series of Poker appeared on television the night before.
The yawning time gap between Hamilton and Rosberg - whose session had earlier been affected by braking problems - may not be a true reflection of their pace, however, as the German's first lap on the faster soft tyres was compromised.
