In the law firms Henderson Law LLP has merged with Greenberg, Traurig LLP’s Chicago office.Jeffry M. Henderson and Harris L. Kay joined the firm as shareholders; Douglas E. Arend and Robert B. Christie were added as of counsel; and Douglas M. Grom is a practice group attorney. Their financial services practice will be part of Greenberg, Traurig’s investment management group. Henderson practices in compliance, regulatory, litigation and managed fund matters. Kay counsels financial services firms and …