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MacDonald at the 2014
Brooklyn Book Festival
MacDonald is a former editor for DC Comics' Vertigo imprint and Disney Adventures, and also edited the graphic novel The Hills Have Eyes: The Beginning from Fox Atomic Comics that served as a prequel to the 2006 film.
She created her long-running blog The Beat: The News Blog of Comics Culture at Comicon.com in June 2004, before moving it to Publishers Weekly in 2006, and to an independent site in 2010. In 2016, she announced she was moving The Beat to the webcomics site Hiveworks. She wrote, "The era of the 'bedroom blogger' is long gone, replaced by corporate entities trying to outdo each other with clickbait headlines and subsisting on popup ads that get more bewildering every day."
MacDonald also served as an editor and writer at Publishers Weekly. In January 2016, MacDonald announced she was laid off from her position at Publisher's Weekly, although she would continue to write for the magazine on a freelance basis.
- Comics Buyer's Guide #1636 (December 2007); Page 135
- McDonald, Heidi (February 16, 2010). "EXCLUSIVE: The Beat to leave Publishers Weekly". The Beat. Retrieved April 22, 2015.
- MacDonald, Heidi (January 13, 2016). "Ch-ch-ch-changes for The Beat". Comics Beat.
- Reid, Calvin (January 29, 2010). "Comics Blog 'The Beat' to Leave Publishers Weekly". Publishers Weekly. Archived from the original on 2010-04-05. Retrieved February 22, 2010.
- Reid, Calvin (February 16, 2010). "MacDonald Relaunches Comics News Blog, The Beat". Publishers Weekly. Retrieved February 22, 2010.