In 1992, Seidler founded Seidler Equity Partners, a private equity firm, in
Marina del Rey, California, which he served as managing partner. In 2018, the firm partnered with MLB to purchase
Rawlings for $395 million. The firm had an estimated $1.8 billion in
assets under management in 2020 and $3.5 billion in 2023.
San Diego Padres In 2012, Seidler, his uncle
Peter O'Malley, and
Ron Fowler formed the O'Malley Group, which purchased MLB's
San Diego Padres from
John Moores for $800 million. The team increased spending in an attempt to contend for a championship, acquiring
Matt Kemp,
Justin Upton, and
James Shields. On November 18, 2020, MLB approved the transfer of the role of chairman from Fowler to Seidler, who purchased part of Fowler's stake in the team to become the largest stakeholder. Seidler increased the Padres' payroll to $214 million for the
2022 season, which was the sixth-highest in MLB. The Padres reached the
2022 National League (NL) Championship Series. Payroll was increased to $237 million for the
2023 MLB season, the third-highest in MLB. He authorized the acquisitions and contract extensions to star players, including
Xander Bogaerts,
Yu Darvish,
Manny Machado,
Fernando Tatís Jr.,
Juan Soto,
Josh Hader, and
Joe Musgrove. The team went 82–80 and finished third in the
NL West. ==Personal life and death==