[3] Lantsman previously worked as a communications advisor to several cabinet members in the 28th Canadian Ministry of Prime Minister Stephen Harper.

[4] Lantsman was previously the national vice president of Public Affairs at Enterprise Canada, a strategic communications firm.

[5] In 2020, upon Peter Kent's retirement from Parliament, Lantsman announced her intention to seek the federal Conservative nomination in Thornhill.

[6] She defeated the incumbent PC member of Provincial Parliament (MPP), Gila Martow, to become the riding's CPC candidate on March 17, 2021.

After a brief stint at The Coca-Cola Company as a senior public affairs advisor, Lantsman returned to government as director of communications for Minister of Finance Joe Oliver.

Following the Harper government's loss in the 2015 Canadian federal election, Lantsman returned to the private sector as a senior director for CIBC Capital Markets.

After Mulroney's loss, Lantsman joined the PC's campaign for the 2018 Ontario general election as its chief spokesperson and war room director.

According to public disclosure records, Lantsman is a director of a Toronto-based Venture Fund focused on investing in early-stage companies that prioritizes women founders.

She was also endorsed by federal and provincial Conservative legislators, including Eric Duncan, Scott Aitchison, Logan Kanapathi, Stan Cho, Roman Baber and Vijay Thanigasalam.

[18] She faced Liberal candidate Gary Gladstone in the 2021 Canadian federal election on September 20 and, per preliminary results, won the seat with 51.3 per cent of the vote.

[22] On February 16, 2022, in response to a question raised by Lantsman regarding the usage of the Emergencies Act, Prime Minister Justin Trudeau replied, "Conservative Party members can stand with people who wave swastikas.

[25] On February 27, Candice Bergen appointed Lantsman to serve in the Conservative Party leadership team as Chair of Outreach in addition to her role as Shadow Minister of Transport.

[27] In January 2023, Lantsman called for an emergency debate in Parliament on the rise in violence in the Toronto area, on the transit system, and across Canada.

Lantsman has supported the approach to tackling the housing crisis articulated by Conservative Leader Pierre Poilievre, advocating for "more approvals and less government gatekeepers.