Mark Kissel (@MarkOSSTF) header
Mark Kissel (@MarkOSSTF) profile picture

Father, Husband, Activist, Teacher, & Musician. Executive Officer, OSSTF Toronto Teachers Bargaining Unit.

Toronto, ON
Joined May 2020
Photo by Mark Kissel (@MarkOSSTF)Photo by Mark Kissel (@MarkOSSTF)Photo by Mark Kissel (@MarkOSSTF)Photo by Mark Kissel (@MarkOSSTF)Photo by Mark Kissel (@MarkOSSTF)Photo by Mark Kissel (@MarkOSSTF)Photo by Mark Kissel (@MarkOSSTF)Photo by Mark Kissel (@MarkOSSTF)Photo by Mark Kissel (@MarkOSSTF)Photo by Mark Kissel (@MarkOSSTF)
Proud to be at the Rally for Education at Queen's Park this weekend. Thousands of educators, students, & allies showed solidarity throughout Ontario, restore funding cut by the Conservative government & better working & learning conditions for educators & students. #OSSTF #onted – at Toronto, Ontario
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All aboard! This bus captain looks forward to helping union members and supporters at the Burlington pick-up location this Saturday starting at 11am! No matter how you choose to travel, see you at Queen's Park this Saturday from 1-2:30pm! – at Toronto, Ontario
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Labour Day 2026! Didn't take enough photos! #OSSTF #onted #solidarity – at Toronto, Ontario
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One of the most fun assignments for my job is organizing social events. Today was an awesome day at the ballpark with 200+ @OSSTFtoronto Teachers' Bargaining Unit Members and their families/friends watching the @BlueJays defeat the Orioles 6-4! And we were on the Jumbotron! – at Toronto, Ontario
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A great weekend of music making with the @OakSymphony. My awesome low brass section knocked it out of the theatre playing Tchaikovsky's 5th Symphony and Sibelius' Violin Concerto! – at Oakville, Ontario
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This weekend I got to play alto trombone in Mozart's Requiem with the @BurlingtonSO and the @GuelphChoir. Bucket list moment: playing the Tuba mirum solo in the Dies irae section of the mass. – at Burlington, Ontario
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Proud to stand up to Doug Ford for post-secondary students and the future of our province! – at Toronto, Ontario
OSSTF Toronto was pleased to support the Hands Off Our Education Rally today at Queen's Park. All Out! #onted #onpoli #osstf
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I am deeply saddened by Joel's sudden passing. We knew each other from our student union days 25+ years ago, and reconnected through OSSTF when he became Associate General Secretary. My heart goes out to his family during this extremely difficult time. – at Toronto, Ontario
It is with great sadness that we announce the unexpected passing of OSSTF/FEESO’s Associate General Secretary, Joel Duff. This is an unimaginable loss to our Federation, as Joel represented the very best of us. Joel joined OSSTF/FEESO in August 2023 as a dedicated labour activist committed to protecting public education. Joel spent the entire 21st century in service of the broader labour movement in a wide range of elected and staff roles. These included serving as the Ontario Organizer for the Canadian Federation of Students, Communications Director for the Ontario Federation of Labour, Executive Political Assistant to the President of the Canadian Labour Congress, and the Associate Executive Director of the Ontario Confederation of University Faculty Associations. Joel came to OSSTF/FEESO with a clear vision: to defend and strengthen public education. He joined a union that had long been at the forefront of change but also stood on the cusp of transformation. With conviction and principle, he set out to strengthen the Federation’s organizing and mobilizing strategy for the challenges ahead. Joel reflected the best qualities of a deeply committed colleague, comrade, and friend. He took the time to understand people and what made them unique, and believed that every person, regardless of their title or role, played a part in building a movement and he made that belief felt. Joel leaves a lasting impact on many across the country, within the labour movement and beyond. He will be remembered with great affection by his neighbours, coworkers, friends, allies, and comrades. OSSTF/FEESO is committed to continuing his work in fighting for a just society for students and workers alike. We extend our sincere condolences to his partner, Lauren, their two children, and all his loved ones.
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It's been a fantastic weekend of learning at the @otffeo Symposium "Empowering teachers for today & tomorrow"! #osstf – at Mississauga, Ontario
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An excellent weekend of music making with the @OakSymphony, playing a Canadian premier (Schreker), Liszt Piano Concerto No. 1 in E-flat Major (with Oakville's own Ryan Huang), and Rachmaninov Symphony No. 2 in e minor! – at Oakville, Ontario
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Always a fun afternoon playing the annual Family Holiday Concert with the @OakSymphony! The brass section dressed up in our best ugly sweaters, and a special guest Elf on the Shelf came to play a tune with me! – at Oakville, Ontario
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It's the most wonderful time of the year for @OSSTFtoronto's Annual Winter Party! Along with our union partners at CUPE 4400 & 416, ETT, & ATU 113, we had a fantastic event! This year we had a make-your-own button station, and 1,500 children have their own swag! Happy holidays! – at Toronto, Ontario
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A great week at the @OFLabour biennial convention this week, representing @osstf! – at Toronto, Ontario
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With the @OFLabour on the streets and at the Ontario provincial legislature in opposition to Bill 33! #OSSTF #onpoli #onted – at Toronto, Ontario
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An amazing weekend of learning at the #OSSTF Educational Services Conference. Kudos to my colleagues on the Provincial Educational Services Committee for organizing an amazing event, and I even got to enjoy a great session with my buddy Gino! – at Toronto, Ontario
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Shame on the Alberta Government for ramming through Bill 2 early this morning, imposing a contract through legislation that was overwhelmingly rejected by teachers twice, then invoking the Notwithstanding Clause. A blatant trampling of Collective Bargaining rights. #abpoli #abed – at Mississauga, Ontario
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Along with my education colleagues across Ontario, I'm proud to wear #RedforEd this week to support public education in Ontario and defend quality learning for all! #OSSTF @OSSTFtoronto – at Kitchener, Ontario
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Pulled out two rarely used instruments today playing with @BurlingtonSO: my alto trombone playing Beethoven's 6th symphony, and my Harmon mute for Gershwin's Rhapsody in Blue. Maybe I'll see one of them again by the end of this decade! – at Burlington, Ontario
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A fun part of my job is organizing social events for @OSSTFtoronto. A hot afternoon @TorontoArgos bmwasn't the result we wanted, but everyone had a great time! – at Toronto, Ontario
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Bolstering the @OPSEU line this morning at Humber College North Campus as full-time support staff strike for fair working conditions and the future of Ontario's College system. @OSSTFtoronto #saveourcolleges #solidarity #osstf – at Toronto, Ontario
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