• Simpson Thacher & Bartlett has announced that Michael J. Osnato, Jr., former chief of the complex financial instruments unit of the Securities and Exchange Commission’s enforcement division, will join the firm as a partner and a member of the firm’s government and internal investigations practice.

• Eckert Seamans welcomes Geraldine A. Cheverko as a partner in the firm’s financial services litigation practice, and Timothy P. Coon as a partner in it’s litigation division.